Prof. H C Verma

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

Research Areas

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 100^oC. 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.

Ph.D Thesis Supervised Students

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

Research Papers

#	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