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RISS 인기검색어
- 검색키워드
- 저자 : S.N. Dolia (검색결과 3 건)
- 무료
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Magnetic behaviour of nanocrystalline Ni–Cu ferrite and the effect of irradiation by 100 MeV Ni ions
S.N. Dolia,Ravi Kumar,S.K. Sharma,M.P. Sharma,Subhash Chander,M. Singh 한국물리학회 2008 Current Applied Physics Vol.8 No.5
The effects of 100 MeV Ni ion irradiation on magnetic properties of nanoparticles of Ni0.8Cu0.₂Fe₂O₄ with average particle sizes of 40Å and 60Å , synthesized by chemical co-precipitation method have been studied. The spinel cubic structures were confirmed by XRD. The average particle size estimated by XRD and by Langevin function fitting are in good agreement for both the pristine and irradiated samples. The blocking temperature increases with particle size and does not change after irradiation. On irradiation by 100 MeV Ni ions, significant changes in the hysteresis loop features are observed, which may be attributed to formation of cluster of defects in the nanocrystalline samples due to swift heavy ion (SHI) irradiation. It is also found that SHI irradiation produces more dominant changes in the hysteresis loop of smaller particle size of 40Å as compared to that of 60Å. The effects of 100 MeV Ni ion irradiation on magnetic properties of nanoparticles of Ni0.8Cu0.₂Fe₂O₄ with average particle sizes of 40Å and 60Å , synthesized by chemical co-precipitation method have been studied. The spinel cubic structures were confirmed by XRD. The average particle size estimated by XRD and by Langevin function fitting are in good agreement for both the pristine and irradiated samples. The blocking temperature increases with particle size and does not change after irradiation. On irradiation by 100 MeV Ni ions, significant changes in the hysteresis loop features are observed, which may be attributed to formation of cluster of defects in the nanocrystalline samples due to swift heavy ion (SHI) irradiation. It is also found that SHI irradiation produces more dominant changes in the hysteresis loop of smaller particle size of 40Å as compared to that of 60Å.
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Size dependent structural and magnetic behaviour of CaFe2O4
Arvind Samariya,S.N. Dolia,Arun S. Prasad,P.K. Sharma,S.P. Pareek,M.S. Dhawan,Sudhish Kumar 한국물리학회 2013 Current Applied Physics Vol.13 No.5
CaFe2O4 nanocrystalline powders were synthesized through solegel treatment in which the stoichiometric mixing of various nitrates involving calcium and iron in presence of citric acid was performed. Subsequently, the as prepared sample was annealed at various temperatures in order to obtain the fine distribution of size including the bulk counterpart. The samples were then characterized using powder X-ray diffraction followed by 57Fe Mössbauer spectroscopy, SQUID as well as vibrating sample magnetometry. The results of spectroanalyses revealed that the samples were formed in single phase cubic spinel structure and exhibits room temperature superparamagnetism, except the bulk one, which crystallizes in characteristic orthorhombic structure of CaFe2O4 and displays trivial coercivity and remanent magnetization at room temperature.
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Thermal transport and its structure dependence in ZnxSe100?x (x = 10, 20, 40 and 50) alloys
Rakesh Sharma,S.N. Dolia,T.P. Sharma,N.S. Saxena 한국물리학회 2006 Current Applied Physics Vol.6 No.5
Simultaneous measurements of eective thermal conductivity (ke) and eective thermal diusivity (ve) of twin pellets ofZnxSe100. x (x . 433 MPa), havebeen made at room temperature using transient plane source (TPS) technique. From the measured values ofke and ve specic heatper unit volume (Cp) has been calculated. The results indicate that both the values ofke and ve increase linearly with increasing Znconcentration. Similar toke and ve, theCp also shows a linear increase with the increase in Zn concentration. This behaviour ofkeand ve with increasing Zn concentration can be explained using structural information obtained from X-ray diraction (XRD) ofthese materials and also using the change in the nature of bond from covalent to iono-covalent in this system. Comparative XRDstudies for structural investigation of ZnxSe100. x (x = 10 and 40) have also been discussed. An eort has also been made to predictvalues ofke,ve and calculated values ofCp.
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