Open AccessPermittivity and modulus spectroscopic study of BaFe0.5Nb0.5O3 ceramics
Author(s) -
Subrat Kumar Kar,
P. Kumar
Publication year - 2013
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac1304181k
Subject(s) - materials science , ceramic , dielectric , activation energy , permittivity , sintering , relaxation (psychology) , perovskite (structure) , immittance , polarization (electrochemistry) , nuclear magnetic resonance , composite material , chemistry , electronic engineering , crystallography , optoelectronics , social psychology , engineering , psychology , physics
Ba(Fe0.5Nb0.5)O3 (BFN) powder was synthesized in single perovskite phase by conventional solid state reaction route and BFN ceramic was obtained by uniaxial pressing and sintering at 1350 °C. Complex immittance like: permittivity and modulus spectroscopic formalism were simultaneously used to explain dielectric behaviour of the ceramics. The activation energy calculated from dielectric relaxation below 100 °C was found to be ~0.19 eV. The activation energy obtained from modulus spectra above 100 °C was ~0.59 eV. The space charge polarization model was used to explain the origin of relaxation and “giant” permittivity of BFN ceramics near room temperature