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B‐site‐doped BiFeO 3 ‐based piezoceramics with enhanced ferro/piezoelectric properties and good temperature stability
Author(s) -
Shi Yunjing,
Yan Fei,
He Xia,
Huang Kaiwei,
Shen Bo,
Zhai Jiwei
Publication year - 2020
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.17325
Subject(s) - materials science , curie temperature , valence (chemistry) , octahedron , piezoelectricity , doping , ceramic , ferroelectricity , impurity , analytical chemistry (journal) , ionic radius , rietveld refinement , piezoelectric coefficient , ion , mineralogy , crystallography , crystal structure , condensed matter physics , chemistry , composite material , ferromagnetism , physics , optoelectronics , organic chemistry , chromatography , dielectric
Abstract Here, B‐site doped 0.725BiFe 0.98 M 0.02 O 3 ‐0.275BaTiO 3 (M = Fe, Sc, Ga, and Al) + 0.8 mol% MnO 2 (abbreviated as BF, BS, BG, and BA) (BFM‐BT) ceramics were designed and prepared to modulate octahedral distortions. According to bond‐valence calculations based on XRD Rietveld refinement data, B‐site doped BFM‐BT ceramics tended to have a higher distortion as the radius of the doping ion decreases, and obtained a great improvement of ferroelectric and piezoelectric performances. B‐site‐doped BFM‐BT ceramics significantly inhibited the formation of impurities, leading to better ferroelectric and piezoelectric performances. The BFM‐BT ceramics exhibited high Curie temperature of 519‐530℃ and good temperature stability for piezoelectric performances. The d 33 values of BF, BS, and BA ceramics remained the room temperature value ranging from room temperature to 470℃. Meanwhile the content of impure phases, oxygen vacancies and valence of Fe 3+ to Fe 2+ decreased with the decreasing radii of B‐site doping ions.