Research Profile

I started my research career in 1977 and since then I have worked in a number of areas, both theoretical and experimental. The central theme had been study of condensed matter using experimental techniques of Nuclear Physics. I have guided 11 PhD theses and have published 134 research Papers in reputed journals. Total citation as of January 2017 is 1734 and h-index is 23.

P.hd Thesis

Title of the Thesis : Studies Of The Electric Field Gradients in Non-cubic Metals Using 57Fe Mössbauer Spectroscopy
Year of Award of the Degree : 1980
Supervised By : Prof. G N Rao and Prof. R M Singru , Ex-Professors Of Dept. Of Physics, IIT Kanpur

Nanofabrication using focused ion beam

Using FIB, we have studied a number of phenomena and used them for fabrication of useful structures at about 20 nm resolutions. Bending of a nano cantilever on irradiation by Ga ion beam studied in my group has attracted wide attention and has been greatly appreciated by the community. Other areas are making nano devices and studying thermal effects on irradiation.

Magnetism in Graphite on irradiation by ion beam

Effect of irradiation by Carbon ion beam and proton ion beam in MeV range on Highly Oriented Pyrolitic Graphite has been studied. The magnetization induced in HOPG in our experiments stands highest till date. VSM and Magnetoresistance are the probing parameters.

Nanosize (4 nm-20 nm) magnetic materials

We synthesize nanoparticles of magnetic oxides using chemical methods. We have grown Zn-ferrites, Ni-ferrites and mixed ferrites using hydrothermal processing where the synthesis is done at high pressure (~10-20 atm) and reasonably low temperatures (~180-220 0 C). We have also developed expertise on co precipitation followed by calcinations and using this we are now able to make nanoparticles of any desired size from 5 nm onwards. A special characteristic is that the particles have a very narrow variance in the size.
We have also developed a UREA hydrolysis method where the nanoparticles are synthesized at a temperature as low as 100oC. The powder so obtained is well dispersed and has significantly different magnetic properties.
Nanoparticles often have large number of crystal defects such as grain boundary defects and vavancies, these are studied using positron annihilation lifetime measurement. We have found interesting results on the location and diffusion of defects in nanoparticles in these studies. The magnetic properties are studied using Mössbauer spectroscopy and Magnetization measurement.

Fe-based alloys

Fe-based alloys of Fe-Al and also Fe-Al with a ternary addition are studied. More specifically, we have studied the effect of mechanical cold working on the defects creation and subsequent redistribution of the component species in the available lattice sites.
We have for the first time developed a simple procedure using electrodeposition, to form alloys of highly immiscible system at room temperature. It does not need any heat treatment or mechanical impacts. Even the local temperatures are not raised as the whole process takes place in solution at room temperature.

Earth Science

We have undertaken a systematic study of meteorites using Mössbauer spectroscopy. We have discovered new symmetries of classification of meteorites which is very significant. We have worked on HED meteorites supposed to come from the asteroid Vesta which is being closely studied by DAWN mission of NASA.
The other area where we have worked is Mass extinction boundaries. By analyzing the 65 million years old sediments from Cretaceous-Tertiary (K/T) junctions from a number of sites, we have investigated the iron mineralogy after the impact killing the majority of the life form. We have provided vital inputs about the causes of the most intense mass extinction 250 million years ago using iron mineralogy.

Mr. Samar Layek

Title of the Thesis : Structural And Magnetic Properties Of Transition Metal Based Oxides/Hydroxides Synthesized Using Specific Methods
Year of Award of the Degree : 2014
Current Designation : PDF at School of Physics and Astronomy, Tel-aviv University, Israel

Nitul Singh Rajput

Title of the Thesis : Physical Characterization Of FIB Fabricated Nanostructures And Developing Newer Methodologies
Year of Award of the Degree : 2013
Current Designation : PDF at Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates(UAE)

Niraj Shukla

Title of the Thesis : Ion Beam Induced Nano Structuring and Magnetic Ordering
Year of Award of the Degree : 2012
Current Designation : Assistant Professor, NIT Patna

Brijesh Pandey

Title of the Thesis : Preparation Of Nanophase Oxides And Iron-based Alloys And Studies On Effect Of Mechanical Deformation On Thier Maganetic And Stuctural Properties
Year of Award of the Degree : 2008
Current Designation : Associate Professor, Symbiosis Institute Of Technology, Pune, Maharashtra

Mukesh Kumar Roy

Title of the Thesis : Metastable Immiscible Alloys
Year of Award of the Degree : 2006
Current Designation : Assistant Professor, Indian Institute of Information Technology, Design and Manufacturing, Jabalpur

Chandan Upadhayay

Title of the Thesis : Controlled Formation Of Nanosize Spinel Ferrites (4-15 nm), And Their Magnetic And Structural Studies
Year of Award of the Degree : 2004
Current Designation : Assistant Professor, School of Material Scince and Technology, IIT(BHU), Varanasi

B. C. Rai

Title of the Thesis : Theoretical Studies of Electronic Properties of Metals and Alloys
Year of Award of the Degree : 1996
Current Designation : Associate Professor, Dept. of Physics, College of Commerce, Arts and Scince, Patna

Bijay Kumar

Title of the Thesis : Study of Electric Field Gradients in Crystals
Year of Award of the Degree : 1988
Current Designation : Retired Faculty, Patna Scince College, Patna

S. Chandra

Title of the Thesis : Semiempirical approaches to study the electric field gradients in metals and alloys
Year of Award of the Degree : 1988
Current Designation : Self Employed, Patna

S. N. Gupta

Title of the Thesis : Studies in zirconium-iron alloys using Mössbauer spectroscopy
Year of Award of the Degree : 1988
Current Designation : Retired Professor, Babasaheb Bhimrao Ambedkar Bihar University, Muzaffarpur, Bihar

Asheshwar Yadav

Title of the Thesis : Methodology and experiments in Mössbauer Effect
Year of Award of the Degree : 1983
Current Designation : Director, Vidya Vihar Institute Of Technology, Purnea, Bihar

# Title Journal Date
# Title Journal Date
1

Structural_and_Magnetic_Properties_of_Dilute Ca2 + Doped Iron Oxide Nanoparticles

S Layek, K Rout, M Mohapatra, S Anand, HC Verma
Journal_of_Nanoscience and Nanotechnology 16 (1), 410-417 2016
2

Room temperature ferromagnetism in Mn-doped NiO nanoparticles

S Layek, HC Verma
Journal of Magnetism and Magnetic Materials 397, 73-78 2016
3

Enhancement in magnetic properties of Ba-doped BiFeO 3 ceramics by mechanical activation

S Layek, HC Verma, A Garg
Journal of Alloys and Compounds 651, 294-301 2015
4

Implication of Mössbauer spectra on the mixing model of eucrites and diogenites (resulting in howardites)

B Bhatia, KR Patel, RP Tripathi, S Layek, HC Verma
CURRENT SCIENCE 109 (2), 331-337 2015
5

Ion-beam-assisted fabrication and manipulation of metallic nanowires

NS Rajput, Z Tong, HC Verma, X Luo
IET Micro & Nano Letters 10 (7), 334-338 2015
6

Effect of annealing on the magnetic properties of ball milled NiO powders

Bhagaban Kisan, P. Saravanan, Samar Layek, H.C. Verma, David Hesp, Vinod Dhanak, Satheesh Krishnamurthy, A. Perumal
Journal of Magnetism and Magnetic Materials 384, 296-301 2015
7

Magnetic and dielectric properties of multiferroic BiFeO3 nanoparticles synthesized by a novel citrate combustion method

S Layek, HC Verma
Materials Science (cond-mat.mtrl-sci); Strongly Correlated Electrons 2015
8

Fe?bearing phases in a ureilite fragment from the asteroid 2008 TC3 (= Almahata Sitta meteorites): A combined Mössbauer spectroscopy and X?ray diffraction study

AM Gismelseed, YA Abdu, MH Shaddad, HC Verma, P Jenniskens
Meteoritics & Planetary Science 49 (8), 1485-1493 2014
9

Application of backscattered electrons in detecting and profiling voids covered by self-supporting metallic thin film

NS Rajput, HC Verma
Scanning 36 (4), 430-436 2014
10

Role of surface functionalization in ZnO: Fe nanostructures

R.N. Lokesh, L. Balakrishnan, K. Jeganathan, Samar Layek, H.C. Verma, N. Gopalakrishnan
Materials Science and Engineering: B 183, 39-46 2014
11

Synthesis, magnetic and Mössbauer spectroscopic studies of Cr doped lithium ferrite nanoparticles

Manish Srivastava, Samar Layek, Jay Singh, Ashok Kumar Das, H.C. Verma, Animesh K. Ojha, Nam Hoon Kim, Joong Hee Lee
Journal of Alloys and Compounds 591, 174-180 2014
12

The influence of precursors on phase evolution of nano iron oxides/oxyhydroxides: optical and magnetic properties

K Rout, M Mohapatra, S Layek, A Dash, HC Verma, S Anand
New Journal of Chemistry 38 (8), 3492-3506 2014
13

Finite size effects in magnetic and optical properties of antiferromagnetic NiO nanoparticles

Bhagaban Kisan, P. C. Shyni, Samar Layek, H. C. Verma, David Hesp, Vinod Dhanak, Satheesh Krishnamurthy, A. Perumal
IEEE Transactions on Magnetics 50 (1), 1-4 2014
14

Beam scanning effect on focused-ion-beam-induced processing

NS Rajput, AK Singh, HC Verma
Radiation Effects and Defects in Solids 168 (7-8), 472-476 2013
15

Mössbauer and Magnetic Studies of Surfactant Mediated Ca-Mg Doped Ferrihydrite Nanoparticles

S Layek, M Mohapatra, S Anand, HC Verma
Journal of nanoscience and nanotechnology 13 (3), 1834-1840 2013
16

Room temperature ferromagnetism in Fe-doped CuO nanoparticles

S Layek, HC Verma
Journal of nanoscience and nanotechnology 13 (3), 1848-1853 2013
17

Preparation, structural and magnetic studies on BiFe1-xCrxO3 (x= 0.0, 0.05 and 0.1) multiferroic nanoparticles

S Layek, S Saha, HC Verma
AIP Advances 3 (3), 032140 2013
18

Preparation and studies on (1-x) BiFeO3-x Li0. 5Fe2. 5O4 (x= 0.25 and 0.5) multiferroic nano-composites

S Layek, SK Bag, HC Verma
2013
19

Structural and magnetic properties of Mg-doped nano-Α-Fe2O3 particles synthesized by surfactant mediation-precipitation technique

M Mohapatra, S Layek, S Anand, HC Verma, BK Mishra
physica status solidi (b) 250 (1), 65-72 2013
20

Magnetoresistance studies of MeV ranged 1H+ and 12C+ ion irradiated HOPG flakes

Neeraj Shukla, Saurabh K. Bose1, Shyam K. Choudhary, Himanshu Pandey, Mihir Sarkar, Nobin Banerji, Anjan K. Gupta, Harish C. Verma
Journal of Magnetism and Magnetic Materials 324 (22), 3887-3892 2012
21

Protonation of an Oxo-Bridged Diiron Unit Gives Two Different Iron Centers: Synthesis and Structure of a New Class of Diiron (III)-µ-hydroxo Bisporphyrins and the Control of Spin States by Using Counterions

S Bhowmik, SK Ghosh, S Layek, HC Verma, SP Rath
Chemistry - A European Journal 18 (41), 13025-13037 2012
22

Role of the substrate in the electrical transport characteristics of focused ion beam fabricated nanogap electrode

NS Rajput, AK Singh, HC Verma
Journal of Applied Physics 112 (2), 024310 2012
23

Magnetoresistance studies of MeV ranged 1Hþ and 12Cþ ion irradiated HOPG flakes

Nitul S. Rajput, Abhishek K. Singh, and H. C. Verma
2012
24

Inducing large ferromagnetic ordering in graphite by 1MeV 12 C+ ion irradiation

N Shukla, M Sarkar, N Banerji, AK Gupta, HC Verma
Carbon 50 (5), 1817-1822 2012
25

Influence of Ca Ions on Surfactant Directed Nucleation and Growth of Nano Structured Iron Oxides and Their Magnetic Properties

M Mohapatra, D Behera, S Layek, S Anand, HC Verma, BK Mishra
Crystal Growth & Design 12 (1), 18-28 2011
26

Electron- and ion-bam-induced maneuvering of nanostructures: phenomenon and applications

NS Rajput, A Banerjee, HC Verma
Nanotechnology 22 (48), 485302 2011
27

Steps to fabricate 3D overhanging nanostructures using focused ion beam

NS Rajput, M Sarkar, A Banerjee, N Shukla, SK Tripathi, HC Verma
IET Micro & Nano Letters 6 (9), 755-758 2011
28

Preparation and Magnetic Studies on 10% Co-doped BiFeO3 Multiferroic Nanoparticles

S Layek, S Das, HC Verma, AB Garg, R Mittal, R Mukhopadhyay
AIP Conference Proceedings-American Institute of Physics 1349 (1), 351 2011
29

Structural, Magnetic and Mossbauer studies of Nanocrystalline Ni-Zn Ferrite, Synthesized using Citrate precursor method, Manthan

RK Singh, A Yadav, A Narayan, S Lyeak, HC Verma
Int. J 12, 9-11 2011
30

Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique

M Mohapatra, K Rout, P Singh, S Anand, S Layek, HC Verma, BK Mishra
Journal of hazardous materials 186 (2), 1751-1757 2011
31

STRUCTURAL, ELECTRICAL AND MAGNETIC STUDIES OF Li-Zn-Ni FERRITES

I Soibam, S Phanjoubam, C Prakash, HC Verma, RK Kotnala
Modern Physics Letters B 24 (21), 2277-2282 2010
32

Novel Low-Temperature Synthesis of Ferroelectric Neodymium-Doped Bismuth Titanate Nanoparticles

P Prakash, A Garglr, MK Roy, HC Verma
Progress in Nanotechnology: Processing, 85 2010
33

Synthesis of γ-Fe2O3 nanoparticles with crystallographic and magnetic texture

S Layek, A Pandey, A Pandey, HC Verma
International Journal of Engineering, Science and Technology 2 (8) 2010
34

Effect of iron doping concentration on magnetic properties of ZnO nanoparticles

PK Sharma, RK Dutta, AC Pandey, S Layek, HC Verma
Journal of Magnetism and Magnetic Materials 321 (17), 2587-2591 2009
35

Nuclearity control in molecular iron phosphates through choice of iron precursors and ancillary ligands

R Murugavel, N Gogoi, KG Suresh, S Layek, HC Verma
Chemistry - An Asian Journal 4 (6), 923-935 2009
36

Preparation and characterization of α-Fe2O3 - CeO2 composite

K Sahoo, M Mohapatra, B Pandey, HC Verma, RP Das, S Anand
Materials Characterization 60 (5), 425-431 2009
37

Chloroform- and Water-Soluble Sol- Gel Derived Eu+++/Y2O3 (Red) and Tb+++/Y2O3 (Green) Nanophosphors: Synthesis, Characterization, and Surface Modification

Pandey A, Roy MK, Pandey A, Zanella M, Sperling RA, Parak WJ, Samaddar AB, Verma HC
IEEE transactions on nanobioscience 8 (1), 43 2009
38

Magnetic structure of Fe-Fe oxide nanoparticles made by electrodeposition

S Kumar, S Layek, B Pandey, HC Verma
International Journal of Engineering, Science and Technology 2 (8) 2009
39

Mössbauer spectroscopic study of China clay samples collected from different Indian sites

R. P. Tripathi, H. C. Verma, S. Chandrasekhar, S. Ramaswamy
ICAME 2007 2009
40

Meteorite fall at Karimati village, Hamirpur, Uttar Pradesh

S Layek, HC Verma
Current science 97 (5), 632-633 2009
41

Effect of Ti 4+ substitution on the hyperfine properties of Li - Sb - Ti ferrites using Mössbauer spectroscopy

Shivaji Chongtham, Ibetombi Soibam, Sumitra Phanjoubam, HNK Sarma, HC Verma
ICAME 2007 2009
42

Mössbauer studies on impactites from Lonar impact crater

HC Verma, Saumitra Misra, M Shyam Prasad, N Bijlani, A Tripathi, Horton Newsom
ICAME 2007 2009
43

Antiferromagnetism in Fe-doped PrRh 2 Si 2: a Mössbauer study

VK Anand, B Pandey, Z Hossain, HC Verma, C Geibel
ICAME 2007 2009
44

Mössbauer studies of nano phase Ce - Fe oxide composites

B Pandey, M Mohapatra, S Anand, HC Verma
ICAME 2007 2009
45

Magnetic studies of multiferroic Bi1 - xSmxFeO3 ceramics synthesized by mechanical activation assisted processes

Deepam Maurya, Harikishan Thota, Ashish Garg, Brajesh Pandey, Prem Chand, HC Verma
Journal of Physics: Condensed Matter 2008/12/9
46

Study of SHI-induced ion beam mixing in Y3+: YIG employing X-ray diffraction and Mössbauer spectroscopy

PU Sharma, MK Roy, Ravi Kumar, HC Verma, HH Joshi, KB Modi
Hyperfine Interactions 2008/11/1
47

A Mössbauer spectroscopic study of simulated weathering of Didwana ordinary chondrites

HC Verma, Neeraj Bijlani, Amita Tripathi, RP Tripathi
Hyperfine Interactions 2008/9/1
48

Properties of nanocrystalline Fe75Si15M10 (M - Cr and Al) powders prepared by mechanical alloying

MPC Kalita, A Perumal, A Srinivasan, Brajesh Pandey, HC Verma
Journal of nanoscience and nanotechnology 2008/8/1
49

Mixing characterization of mechanically milled Fe75Si15M10 powders using Mössbauer spectroscopy

Brajesh Pandey, MPC Kalita, A Perumal, A Srinivasan, HC Verma
Hyperfine Interactions 2008/6/1
50

Synthesis, characterization and dielectric properties of europium-doped barium titanate nanopowders

MK Rath, GK Pradhan, B Pandey, HC Verma, BK Roul, S Anand
Materials Letters 2008/5/15
51

Ararki (L5) chondrite: The first meteorite find in Thar Desert of India

N Bhandari, SVS Murty, PN Shukla, RR Mahajan, AD Shukla, G Lashkari, MS Sisodia, RP Tripathi, G Parthasarathy, HC Verma, IA Franchi
Meteoritics & Planetary Science 2008/4/1
52

Mechanical strain characteristics of cold worked Fe72 Al28 and Fe75 Ni25 alloys: A positron annihilation coincidence Doppler broadening view

Brajesh Pandey, HC Verma
Intermetallics 2008/3/31
53

Effect of cooling conditions on the magnetic structure of multiferroic BiFeO3 synthesized by mechanical activation

Harikishan Thota, Ashish Garg, Brajesh Pandey, HC Verma
ICAME 2007 2008
54

Preferential occupation of pyroxene sites by iron in diogenite meteorites

HC Verma, VC Tewari, BS Paliwal, RP Tripathi
ICAME 2007 2008
55

Anomalous magnetic behaviour of zinc and chromium ferrites without any hyperfine splitting

B Pandey, HC Verma
ICAME 2007 2008
56

Characterization and photoluminescence studies on hydrothermally synthesized Mn-doped barium titanate nano powders

T Sahoo, GK Pradhan, MK Rath, B Pandey, HC Verma, S Nandy, KK Chattopadhyay, S Anand
Materials Letters 2007/10/31
57

Applications of mössbauer spectroscopy-Indian research efforts-Preface

HC Verma, Brajesh Pandey
INDIAN JOURNAL OF PURE & APPLIED PHYSICS 2007/10/1
58

Anomalous structural and magnetic behaviour of Fe-25 at.% Ni alloy due to mechanical strain

Brajesh Pandey, HC Verma
Journal of Physics: Condensed Matter 2007/9/11
59

Demonstration of Lenz’s law: Analysis of a magnet falling through a conducting tube

MK Roy, Manoj K Harbola, HC Verma
American Journal of Physics 2007/8
60

Effect of size and synthesis route on the magnetic properties of chemically prepared nanosize ZnFe2O4

C Upadhyay, HC Verma, V Sathe, AV Pimpale
Journal of Magnetism and Magnetic Materials 2007/5/31
61

Application of 57Fe Mössbauer spectroscopy to hydrometallurgy

S Anand, HC Verma
CSIR 2007
62

Investigation of Magnetic Behaviour of Mechanical Activation Derived Multiferroic BiFeO3

Ashish Garg, Hari Kishan Thota, Brajesh Pandey, HC Verma
MRS Proceedings 2007
63

Application of 57Fe Möossbauer spectroscopy to hydrometallurgy

S Anand, HC Verma
Indian journal of pure & applied physics 2007
64

KTB iron mineralogy at iridium deficient layers revealed by Mössbauer spectroscopy

Brajesh Pandey, Amita Tripathi, RP Tripathi, HC Verma
ICAME 2005 2007
65

Mössbauer studies of CuFe-72% alloy

HC Verma
CSIR 2007
66

Magnetization anomalies of nanosize zinc ferrite particles prepared using electrodeposition

MK Roy, HC Verma
Journal of magnetism and magnetic materials 2006/11/30
67

Quenching of superparamagnetic relaxation in NiFe2O4 nanoparticles at room temperature

MK Roy, HC Verma
Journal of Physics: Condensed Matter 2006/7/21
68

Microstructural and photo luminescence studies on hydrothermally synthesized Ce-doped barium titanate nanocrystals

T Sahoo, SK Tripathy, S Nandy, B Pandey, HC Verma, KK Chattopadhyay, S Anand
Materials Science and Engineering: B 2006/7/15
69

57Fe Mössbauer Spectroscopic and Bulk Magnetic Study of the Spinel System: CuAl x Cr x Fe 2-2x O4

Uday N Trivedi, HH Joshi, M Chhantbar, K Modi, HC Verma
Magnetics Conference, 2006. INTERMAG 2006. IEEE International 2006/5/8
70

Sol- gel synthesis and characterization of Eu+++/Y2O3 nanophosphors by an alkoxide precursor

Ashutosh Pandey, Anjana Pandey, Mukesh Kumar Roy, HC Verma
Materials chemistry and physics 2006/4/10
71

Mössbauer spectroscopic studies of Fe-20 wt.% Cr ball milled alloy

Brajesh Pandey, M Ananda Rao, HC Verma, S Bhargava
Hyperfine interactions 2006/4/1
72

Application of positron annihilation: Study of pervaporation dense membranes

SV Satyanarayana, VS Subrahmanyam, HC Verma, A Sharma, PK Bhattacharya
Polymer 2006/2/8
73

Ion beam facilities at IIT Kanpur for micro and nanoscale science and engineering

Vishwas N Kulkarni, S Bhattacharjee, HC Verma, GK Mehta
DAE-BRNS Indian particle accelerator conference-2006 2006
74

Structural and compositional changes during mechanical milling of the Fe - Cr system

Brajesh Pandey, M Ananda Rao, HC Verma, S Bhargava
Journal of Physics: Condensed Matter 2005/12/2
75

Characteristic length scales of nanosize zinc ferrite

MK Roy, Bidyut Haldar, HC Verma
Nanotechnology 2005/12/1
76

Effect of Ni doping on the properties of fine magnetite particles

M Mohapatra, Brajesh Pandey, Chandan Upadhyay, S Anand, RP Das, HC Verma
Journal of magnetism and magnetic materials 2005/8/31
77

Phase changes in Fe72 - x Al28 Crx (x= 0, 2, 4, 6) alloys due to mechanical strain

Brajesh Pandey, HC Verma
Pramana - J. Phys 2005/2/1
78

Erratum to "Effect of addition of Cu(II), Ni(II) and Co(II) ions on conversion of Crystalline goethite to magnetite in NH3-FeSO4-H2O medium.

S Anand, RP Das, M Mohapatra, HC Verma, Chandan Upadhyay
International journal of mineral processing, 69, 75-86, 2005
79

Anomalous Mössbauer parameters in the second generation regolith Ghubara meteorite

HC Verma, RP Tripathi
Meteoritics & Planetary Science 2004/10/1
80

Anomalous change in electron density at nuclear sites in nanosize zinc ferrite

C Upadhyay, HC Verma
Applied physics letters 2004/9/13
81

Defect studies in Fe - Cu alloys prepared by electrodeposition

MK Roy, VS Subrahmanyam, HC Verma
Physics Letters A 2004/8/2
82

Cation distribution in nanosized Ni-Zn ferrites

Chandan Upadhyay, HC Verma, S Anand
Journal of applied physics 2004/5/15
83

Mössbauer studies of Fe-Cu alloys prepared by electrodeposition

MK Roy, HC Verma
Journal of magnetism and magnetic materials 2004/3/31
84

Section 1-Defects, nano-precipitates and nano-materials-Identification of Positron Trapping Sites in Nanocrystalline ZnFe2O4 by Coincidence Doppler Broadening Measurements

PMG Nambissan, C Upadhyay, HC Verma
Materials Science Forum 2004
85

Identification of positron trapping sites in nanocrystalline ZnFe2O4 by coincidence Doppler broadening measurements

PMG Nambissan, C Upadhyay, HC Verma
Materials Science Forum 2004
86

Mössbauer and positron annihilation studies in plastically deformed Fe72 - x Al28 Ti x (x= 0, 2, 9) alloys

Brajesh Pandey, PMG Nambissan, Satyam Suwas, HC Verma
Journal of magnetism and magnetic materials 2003/7/31
87

A citrate process to synthesize nanocrystalline zinc ferrite from 7 to 23 nm crystallite size

A Kundu, S Anand, HC Verma
Powder technology 2003/6/24
88

Systematics of Mössbauer absorption areas in ordinary chondrites and applications to a newly fallen meteorite in Jodhpur, India

HC Verma, Kavi Jee, RP Tripathi
Meteoritics and Planetary Science 2003/6
89

Magnetic properties of a partially inverted zinc ferrite synthesized by a new coprecipitation technique using urea

Animesh Kundu, C Upadhyay, HC Verma
Physics Letters A 2003/5/19
90

Positron lifetime spectroscopic studies of nanocrystalline ZnFe2O4

PMG Nambissan, C Upadhyay, HC Verma
Journal of applied Physics 2003/5/15
91

Effect of addition of Cu (II), Ni (II) and Co (II) ions on conversion of crystalline goethite to magnetite in NH3 - FeSO4 - H2O medium

M Mohapatra, S Anand, RP Das, Chandan Upadhyay, HC Verma
International Journal of Mineral Processing 2003/3/31
92

Effect of preparation conditions on formation of nanophase Ni-Zn ferrites through hydrothermal technique

Chandan Upadhyay, Devabrata Mishra, HC Verma, S Anand, RP Das
Journal of Magnetism and Magnetic Materials 2003/3/31
93

Preparation and characterization of Cu (II), Ni (II) or Co (II) ion-doped goethite samples and their conversion to magnetite in NH3 - FeSO4 - H2O medium

M Mohapatra, S Anand, RP Das, Chandan Upadhyay, HC Verma
Hydrometallurgy 2002/10/31
94

Structural, thermal stability and defect studies of Fe-Ag alloy prepared by electrodeposition technique

MK Roy, PMG Nambissan, HC Verma
Journal of alloys and compounds 2002/10/28
95

Aqueous reduction of crystalline goethite under ammoniacal conditions

M Mohapatra, S Anand, RP Das, C Upadhyay, HC Verma
Hydrometallurgy 2002/9/30
96

Mössbauer spectroscopic studies of an oxidized ordinary chondrite fallen at Itawa-Bhopji, India

HC Verma, A Rawat, BS Paliwal, RP Tripathi
Hyperfine Interactions 2002/9/1
97

Thermal decomposition pattern and particle size estimation of iron minerals associated with the cretaceous-tertiary boundary at Gubbio

HC Verma, Chandan Upadhyay, Amita Tripathi, RP Tripathi, N Bhandari
Meteoritics and Planetary Science 2002/7/1
98

Evidence of impact at the Permian/Triassic boundary from Mössbauer Spectroscopy

HC Verma, C Upadhyay, RP Tripathi, AD Shukla, N Bhandari
Hyperfine interactions 2002/6/1
99

Phase transformations in Fe72 - x Al28 Ti x (x= 0, 2, 6, 9) alloys induced by severe plastic deformation

Brajesh Pandey, Satyam Suwas, HC Verma
Journal of magnetism and magnetic materials 2002/4/30
100

Global occurrence of magnetic and superparamagnetic iron phases in Cretaceous-Tertiary boundary clays

N Bhandari, HC Verma, C Upadhyay, Amita Tripathi, RP Tripathi
SPECIAL PAPERS-GEOLOGICAL SOCIETY OF AMERICA 2002/1/1
101

Mössbauer studies of cation distribution in natural chromites from Boula-Nausahi igneous complex, Keonjhar district, Orissa, India

HC Verma, JK Mohanty, RP Tripathi
Journal of alloys and compounds 2001/8/9
102

Mössbauer studies of nanosize Mn 1 - x Zn x Fe2O4

C Upadhyay, HC Verma, C Rath, KK Sahu, S Anand, RP Das, NC Mishra
Journal of alloys and compounds 2001/8/9
103

Nano-sized iron phases at the K/T and P/T boundaries revealed by Mössbauer spectroscopy

HC Verma, C Upadhyay, RP Tripathi, A Tripathi, AD Shukla, N Bhandari
Lunar and Planetary Science Conference 2001/3
104

Mossbauer spectroscopic studies of the chemical state of iron in sub-crops of Cambay Basin, India

VK Godara, Amita Tripathi Dewakar, HC Verma, RP Tripathi
AAAPG-2000 2000/9/1
105

Site preferences for cobalt and cobalt-titanium in substituted barium ferrites

C Upadhyay, DK Rai, HC Verma, J Kumar
INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE A 2001
106

Characterization of iron-bearing minerals in Giril lignite from Rajasthan and study of their decomposition during combustion using 57 Fe Mössbauer spectroscopy

HC Verma, RP Tripathi
Fuel 2000/5/31
107

Classification of the Didwana?Rajod meteorite: A Mössbauer spectroscopic study

BS Paliwal, RP Tripathi, HC Verma, SK Sharma
Meteoritics & Planetary Science 2000/5/1
108

Mössbauer studies of phase stability in mechanically stressed Fe - 28at% Al alloy

HC Verma, Satyam Suwas
Journal of magnetism and magnetic materials 2000/4/30
109

Appearance of superparamagnetism on heating nanosize Mn 0.65 Zn 0.35 Fe2 O4

Chandana Rath, NC Mishra, S Anand, RP Das, KK Sahu, Chandan Upadhyay, HC Verma
Applied Physics Letters 2000/1/24
110

Mössbauer spectroscopic studies of the Piplia Kalan (eucrite) and Lohawat (howardite) meteorites

RP Tripathi, SK Sharma, KL Shrivastava, HC Verma
Meteoritics & Planetary Science 2000/1/1
111

MeV ion beam mixing of Au in Fe78B13Si9 amorphous metallic alloy

Sankar Dhar, Tapobrata Som, Harish C Verma, Vishwas N Kulkarni
Radiation Physics and Chemistry 1998/6/30
112

Monte Carlo simulations of phase transitions in liquid crystals

HC Verma
Physics Letters A 1996/6/17
113

Charge shift model for calculation of electric field gradient in tetragonal closed packed metals

HC Verma, B Kumar, BC Rai, S Chandra
Hyperfine Interactions 1989/10/1
114

Studies of Zr0. 8Fe02 alloys using mössbauer spectroscopy

SN Gupta, HC Verma
physica status solidi (a) 1988/1/16
115

Charge Shift Model Calculation of the Cohesive Energy of Magnesium

S Chandra, HC Verma
physica status solidi (b) 1988/1/1
116

Cohesive energy of beryllium calculated with the use of the charge-shift model

S Chandra, HC Verma
Physical Review B 1986/7/15
117

Summation of lattice contributions

HC Verma
Hyperfine Interactions 1985/11/11
118

An Empirical Model for Electric Field Gradients in Group IIIb and IVb Metals

S Chandra, HC Verma
physica status solidi (b) 1985/9/1
119

Electric field gradients in simple tetragonal lattice at interstitial site

DP Verma, B Kumar, HC Verma
Pramana 1985/8/1
120

Validity regions of charge shift model

SN Gupta, G Varma, HC Verma
Pramana 1984/7/1
121

Mössbauer effect investigations of FeZn alloy and analysis using charge shift model

HC Verma
Pramana 1984/1/1
122

Quadrupole interaction at Fe 57 nuclei in Sb metal

V Anila, HC Verma, DK Gupta, GN Rao
Hyperfine Interactions 1983/12/7
123

Systematic study of the temperature dependence of electric field gradients at probe nuclei in non-cubic metals

HC Verma, GN Rao
Hyperfine Interactions 1983/12/7
124

Lattice sum of electric field gradients in tetragonal crystals

DP Verma, A Yadav, HC Verma
Pramana 1983/12/1
125

Exact solution of the Schrodinger equation for a particle in a tetrahedral box

HR Krishnamurthy, HS Mani, HC Verma
Journal of Physics A: Mathematical and General 1982/7/1
126

Erratum: Quadrupole interactions at Fe 57 in Te metal

HC Verma, GN Rao
Physical Review B 1981/10/1
127

Quadrupole interaction at 57Fe in zirconium metal

HC Verma, J Chappert, GN Rao
Hyperfine Interactions 1981/7/21
128

The electric field gradient at 57Fe in zinc and comparisons with the conduction-electron charge-shift model

HC Verma, GN Rao
Physics Letters A 1981/4/6
129

Moessbauer studies of zirconium iron alloys

BM Lal, NV Nair, SN Gupta, HC Verma
Silver Jubilee Physics Symposium: 25th year of nuclear physics and solid state physics symposium [Papers] 1981
130

Quadrupole interactions at Fe 57 in Te metal

HC Verma, GN Rao
Physical Review B 1980/10/1
131

Measurement of quadrupole interaction frequencies (QIF) of 57Fe in noncubic host crystals

V Anila, HC Verma, GN Rao, DK Gupta
Proceedings of the nuclear physics and solid state physics symposium [held at] Bombay, December 28-31, 1978 1979
132

Measurement of quadrupole splitting in some noncubic iron based alloys

V Anila, HC Verma, GN Rao, DK Gupta
Proceedings of the nuclear physics and solid state physics symposium [held at] Bombay, December 28-31, 1978 1979
133

Study of quadrupole interaction at 57Fe in zirconium metal

HC Verma, GN Rao
Proceedings of the nuclear physics and solid state physics symposium [held at] Bombay, December 28-31, 1978 1979
134

TEMPERATURE DEPENDENCE OF ELECTRIC FIELD GRADIENT IN TETRAGONAL CLOSE PACKED METALS

BC RAI, A KUMAR, HC VERMA