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Manganese‐Doped BiFeO 3 –BaTiO 3 High‐Temperature Piezoelectric Ceramics: Phase Structures and Defect Mechanism
Author(s) -
Yao Zhonghua,
Xu Chaobing,
Hao Hua,
Xu Qi,
Hu Wei,
Cao Minghe,
Liu Hanxing
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12500
Subject(s) - materials science , piezoelectricity , manganese , doping , tetragonal crystal system , ceramic , electrical resistivity and conductivity , phase (matter) , condensed matter physics , mineralogy , composite material , optoelectronics , metallurgy , chemistry , physics , organic chemistry , engineering , electrical engineering
The bulk BiFeO 3 –BaTiO 3 system has been studied as a potential lead‐free high‐temperature piezoelectric material. It is found that the multivalency manganese‐doped 0.8BiFeO 3 –0.2BaTiO 3 ceramics exhibit the coexistence of tetragonal and rhombohedral phases, whereas Mn doping improves the resistivity and exhibits hard characteristic. The optimal properties were obtained at 0.12 wt% Mn addition exhibiting T c ˜ 637°C. The increase of T c in Mn‐modified compositions can be ascribed to the appearance of internal electric bias field by acceptor doping. The combination of good electrical properties and high T c makes these ceramics suitable for elevated temperature piezoelectric devices.
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