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Temperature‐insensitive strain behavior in 0.99[(1− x )Bi 0.5 (Na 0.80 K 0.20 ) 0.5 TiO 3 − x BiFeO 3 ]–0.01Ta lead‐free piezoelectric ceramics
Author(s) -
Yu Jingru,
Chu Shanshan,
Song Xianmeng,
Gao Han,
Pan Junchen,
Hao Jigong
Publication year - 2017
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.12681
Subject(s) - materials science , phase boundary , ferroelectricity , phase transition , phase (matter) , atmospheric temperature range , thermal stability , sintering , ceramic , analytical chemistry (journal) , condensed matter physics , dielectric , thermodynamics , composite material , chemical engineering , optoelectronics , chemistry , physics , organic chemistry , chromatography , engineering
Lead‐free 0.99[(1− x )Bi 0.5 (Na 0.80 K 0.20 ) 0.5 TiO 3 − x BiFeO 3 ]–0.01Ta ( BNKT 20–100 x BF –1Ta) lead‐free piezoelectric ceramics were fabricated through conventional solid state sintering method. Results showed that change of BF content in the BNKT 20–100 x BF –1Ta induced a phase transition from ferroelectric to ergodic relaxor phase with a significant disruption of the long‐range ferroelectric order. A large electric‐field‐induced strain of 0.36% (at 80 kV/cm driving field, corresponding to a large signal d 33∗of ~450 pm/V) which is derived from a reversible field‐induced ergodic relaxor to ferroelectric phase transformation, was obtained in the composition with x =0.01 near the ferroelectric‐ergodic relaxor phase boundary. Moreover, an attractive property for application in nonlinear actuators demanding enhanced thermal stability was obtained in this material, which showed a temperature‐insensitive strain characteristic in the temperature range from room temperature to 100°C.