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Temperature Stable Dielectric Properties in BaTiO 3 –Bi(Mg 2/3 Nb 1/3 )O 3 –NaNbO 3 Solid Solution
Author(s) -
Muhammad Raz,
Ali Asif,
Camargo Javier,
Castro Miriam S.
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000243
Subject(s) - materials science , dielectric , analytical chemistry (journal) , raman spectroscopy , perovskite (structure) , atmospheric temperature range , sintering , ceramic , dielectric loss , phase (matter) , mineralogy , crystallography , chemistry , metallurgy , optics , thermodynamics , optoelectronics , physics , organic chemistry , chromatography
0.5BaTiO 3 –(0.5– x )Bi(Mg 2/3 Nb 1/3 )O 3 – x NaNbO 3 ( x =0.1, 0.2 and 0.3) samples were processed via solid‐state sintering route. Phase identification of the samples showed the formation of a single‐phase cubic perovskite‐structure (space group Pm ‐3  m ) which was further confirmed using Raman spectroscopy. Microstructural analysis of the samples revealed some voids in the samples while grain size was observed to decrease with increasing NaNbO 3 concentration. The addition of NaNbO 3 shifted T m to below room temperature and the stability range of 0.5BaTiO 3 –0.5Bi(Mg 2/3 Nb 1/3 )O 3 ceramics was enhanced. The sample with x =0.20 exhibited ϵ r(mid) = 400 ±15% stable over a wide temperature range from −85 to 500 °C and most importantly a low dielectric loss of < 0.05 stable across a wide temperature range −100 to 426 °C was maintained. The thermally stable dielectric properties of sample x =0.2 suggests that it could be useful candidate material for capacitor applications in both low (X9R) as well as harsh environment applications.

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