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Enhanced ferroelectric properties and thermal stability of Mn‐doped 0.96(Bi 0.5 Na 0.5 )TiO 3 ‐0.04BiAlO 3 ceramics
Author(s) -
Peng Ping,
Nie Hengchang,
Liu Zhen,
Ren Weijun,
Cao Fei,
Wang Genshui,
Dong Xianlin
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14645
Subject(s) - ferroelectricity , depolarization , materials science , manganese , analytical chemistry (journal) , microstructure , thermal stability , ferroelectric ceramics , polarization (electrochemistry) , mineralogy , ceramic , doping , grain size , limiting , dielectric , composite material , chemistry , metallurgy , optoelectronics , medicine , organic chemistry , chromatography , endocrinology , mechanical engineering , engineering
(Bi 0.5 Na 0.5 )TiO 3 –BiAlO 3 lead‐free materials exhibit excellent ferroelectric properties, but its depolarization temperature is relatively low which is the major obstacle limiting the material's practical application. In this study, the effects of Manganese (Mn) modification on the microstructure, ferroelectric properties and depolarization behavior of 0.96(Bi 0.5 Na 0.5 )(Ti 1− x Mn x )O 3 –0.04BiAlO 3 ceramics were investigated. It was found that the average grain size was enlarged and ferroelectric properties were enhanced with small Mn addition, meanwhile the tangent loss decreased. The remnant polarization ( P r ) of the samples reached an optimal value (~41 μC/cm 2 ) as Mn content increased up to 0.7 mol%, whereas further addition resulted in the decrease in P r . Moreover, appropriate Mn addition ( x= 0.7%) can improve the depolarization temperature from 140°C to 161°C determined from thermally stimulated depolarization currents measurement.