Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 113, Issue -, Pages 186-193Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2017.10.021
Keywords
AC conductivity; Complex impedance spectroscopy; Correlated barrier hopping model; DC conductivity; Relaxation phenomena
Funding
- DST-INSPIRE Fellowship, New Delhi, India
- DRS-1 from UGC, New Delhi, India under SAP [530/17/DRS/2009]
- FIST program of DST, New Delhi, India [SR/FST/PSI-179/2012]
- SERB under the DST Fast Track Scheme for Young Scientists, New Delhi, India [SR/FTP/PS-036/2011]
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In this study, samarium (Sm)-doped multiferroic composites of 0.8BiSm(x)Fe(1-x)O(3)-0.2PbTiO(3) where x = 0.05, 0.10, 0.15, and 0.20 were prepared via the conventional solid state reaction route. The electrical properties of these composites were analyzed using an impedance analyzer over a wide range of temperatures and frequencies (10(2)-10(6) Hz). The impedance and modulus analyses confirmed the presence of both bulk and grain boundary effects in the materials. The temperature dependence of impedance and modulus spectrum indicated the negative temperature coefficient of resistance behavior. The dielectric relaxation exhibited non-Debye type behavior and it was temperature dependent. The relaxation time (tau) and DC conductivity followed an Arrhenius type behavior. The frequency-dependent AC conductivity obeyed Jonscher's power law. The correlated barrier hopping model was appropriate to understand the conduction mechanism in the composites considered.
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