Dielectric relaxation and conduction mechanism studies of BNT-BT-BKT ceramics

Chandrasekhar, M and Khatua, Dipak Kumar and Pattanayak, Ranjit and Kumar, P (2017) Dielectric relaxation and conduction mechanism studies of BNT-BT-BKT ceramics. In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 111 . pp. 160-166.

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Abstract

Electrical properties of 0.884Bi(0.5)Na(0.5)TiO(3)-0.036BaTiO(3)-0.08Bi(05)K(0.5)TiO(3) ceramic samples were investigated in 100Hz to 1 MHz frequency range and in 200-450 degrees C temperature range using impedance spectroscopy technique. Real part of impedance versus frequency plots in lower frequency region revealed its PTCR behavior and NTCR behaviors in higher frequency region. Impedance study also suggested the presence of non-Debye type relaxation mechanism. Cole-Cole plots suggested two relaxation regions, in which grain and grain, grain boundary effects were prominent in lower and high temperature regions, respectively. DC conductivity followed Arrhenius law with an activation energy of similar to 0.79 and 1.2 eV, which suggested that the charge carrier were cation vacancies in lower temperature region whereas cation vacancies and oxygen vacancies in higher temperature region.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	30 Oct 2017 03:41
Last Modified:	30 Oct 2017 03:41
URI:	http://eprints.iisc.ac.in/id/eprint/58078

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