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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13641
Title: Dielectric relaxation and ac conductivity of wo3 added (Na1/2Bi1/2)TiO3 ceramic
Authors: Prasad K.
Kumari K.
Chandra K.P.
Yadav, Kamlesh Kumar
Sen S.
Published in: Materials Science- Poland
Abstract: Ceramic samples of WO3 added (Na1/2Bi1/2)TiO3 were prepared using a high-temperature solid-state reaction method. X-ray diffraction analyses indicate the formation of a single-phase orthorhombic structure. The apparent particle size and lattice strain are estimated using the Williamson-Hall plot. Dielectric studies revealed the relaxor behaviour and addition of WO3 shifted phase transition temperature as well as depolarization temperature of (Na1/2Bi1/2)TiO3 to higher side. ac impedance plots were used to analyse the electrical behaviour of samples in function of frequency at various temperatures. The ac impedance studies revealed the presence of the grain boundary effect and evidence of a negative temperature coefficient of resistance. Cole-Cole analysis indicated a non-Debye type dielectric relaxation. The ac conductivity obeys the universal power law. The pair approximation type correlated barrier hopping model explains the universal behaviour of the s exponent. The apparent activation energy of the conduction process and density of states at the Fermi level have been discussed.
Citation: Materials Science- Poland (2009), 27(2): 373-384
URI: http://repository.iitr.ac.in/handle/123456789/13641
Issue Date: 2009
Keywords: (Na1/2Bi1/2)TiO3
Ac conductivity
Dielectric relaxation
Impedance spectroscopy
ISSN: 1371339
Author Scopus IDs: 57118815700
23091285300
15070444700
7005825645
57201072179
Author Affiliations: Prasad, K., Materials Research Laboratory, University Department of Physics, T.M.Bhagalpur University, Bhagalpur 812 007, India
Kumari, K., Materials Research Laboratory, University Department of Physics, T.M.Bhagalpur University, Bhagalpur 812 007, India
Chandra, K.P., Department of Physics, S.M. College, T. M. Bhagalpur University, Bhagalpur 812 001, India
Yadav, K.L., Department of Physics, Indian Institute of Technology, Roorkee 247 667, India
Sen, S., National Metallurgical Laboratory, Jamshedpur 831 007, India
Corresponding Author: Prasad, K.; Materials Research Laboratory, University Department of Physics, T.M.Bhagalpur University, Bhagalpur 812 007, India; email: k.prasad65@gmail.com
Appears in Collections:Journal Publications [PH]

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