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Large strain response with low driving field in Bi 1/2 Na 1/2 TiO 3 –Bi 1/2 K 1/2 TiO 3 –Bi(Mg 2/3 Nb 1/3 )O 3 ceramics
Author(s) -
Dong Guangzhi,
Fan Huiqing,
Shi Jing,
Li Qiang
Publication year - 2018
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.15589
Subject(s) - ferroelectricity , materials science , ternary operation , dielectric , electric field , piezoelectricity , phase (matter) , analytical chemistry (journal) , strain (injury) , phase transition , solid solution , condensed matter physics , crystallography , chemistry , physics , optoelectronics , composite material , organic chemistry , chromatography , quantum mechanics , computer science , medicine , metallurgy , programming language
The (1− x )(0.8Bi 1/2 Na 1/2 TiO 3 –0.2Bi 1/2 K 1/2 TiO 3 )− x BiM g 2/3 Nb 1/3 O 3 (100 x BMN ) ternary solid solutions were designed and prepared using a conventional solid‐state reaction. Temperature and compositional dependent ferroelectric, piezoelectric, dielectric features, and structural evolution were systematically studied. At the critical composition of 2 BMN , a large bipolar strain of 0.43% was achieved at 55 kV/cm, and the normalized strain reaches to 862 pm/V at a low driving electric field of 40 kV/cm. It was found that the substitution of BiMg 2/3 Nb 1/3 O 3 induces a transformation from ferroelectric to relaxor phase by disrupting the long range ferroelectric order. Therefore, as the external electric field was applied, a relaxor‐ferroelectric phase transition will be induced. This is contributed to the giant strain. The results above suggest that such a ternary composition is a promising candidate for application to actuator.