Origin of relaxor behavior in 0.78(Na0.5Bi0.5)TiO3-0.2SrTiO(3)-0.02BaTiO(3) ceramic: An electrical modulus study

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The relaxation dynamics of the polar nano-regions (PNRs) in the 0.78Na(0.5)Bi(0.5)TiO(3)-0.2SrTiO(3)-0.02BaTiO(3) lead free ternary system over a wide temperature range (50-650 degrees C) is investigated using complex electric modulus formalism. The modulus spectra are analyzed across three characteristic temperatures T-B, T-m, and T-f with a special focus on the evolution of dynamics of PNRs. Portraying high capacitance of shoulder response as compared to the bulk response in M ''(f) spectra shows indirectly the presence of highly polarisable entities that persist even above T-B and below T-f. The activation energies extracted from an Arrhenius fit to the relaxation time of both bulk and shoulder response signify different relaxation mechanisms. Further, the value of the stretched exponent beta and the scaling behavior study of the M ''(f) spectra envisage temperature sensitive dipolar relaxation.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-10
Language
English
Article Type
Article
Keywords

DIFFUSE PHASE-TRANSITIONS; IMPEDANCE SPECTROSCOPY; FERROELECTRIC PBMG1/3NB2/3O3; DIELECTRIC-SPECTROSCOPY; SCATTERING SPECTROSCOPY; MODEL; NA0.5BI0.5TIO3; RELAXATION

Citation

MATERIALS RESEARCH BULLETIN, v.106, pp.459 - 464

ISSN
0025-5408
DOI
10.1016/j.materresbull.2018.06.041
URI
http://hdl.handle.net/10203/245548
Appears in Collection
MS-Journal Papers(저널논문)
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