Enhanced Piezoelectric Properties of Tetragonal (Bi 1/2 K 1/2 )TiO 3  Lead‐Free Ceramics by Substitution of Pure Bi‐Based Bi(Mg 2/3 Nb 1/3 )O 3 | Zendy

Pan Zhao | Zendy; Wang Qi | Zendy; Chen Jun | Zendy; Liu Chuang | Zendy; Fan Longlong | Zendy; Liu Laijun | Zendy; Fang Liang | Zendy; Xing Xianran | Zendy

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Enhanced Piezoelectric Properties of Tetragonal (Bi 1/2 K 1/2 )TiO 3 Lead‐Free Ceramics by Substitution of Pure Bi‐Based Bi(Mg 2/3 Nb 1/3 )O 3

Author(s) -

Pan Zhao,

Wang Qi,

Chen Jun,

Liu Chuang,

Fan Longlong,

Liu Laijun,

Fang Liang,

Xing Xianran

Publication year - 2015

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.13255

Subject(s) - phase boundary , curie temperature , piezoelectricity , tetragonal crystal system , materials science , coercivity , dielectric , ceramic , mineralogy , phase (matter) , analytical chemistry (journal) , condensed matter physics , crystal structure , crystallography , composite material , chemistry , physics , optoelectronics , ferromagnetism , organic chemistry , chromatography

Crystal structure, piezoelectric, and dielectric properties were investigated in the new lead‐free BKT‐based piezoelectric ceramics of (1− x )( Bi 1/2 K 1/2 ) TiO 3 ‐ x Bi ( Mg 2/3 Nb 1/3 ) O 3 . The morphotropic phase boundary (MPB) of the system between tetragonal and rhombohedral phases lies near the composition of x = 0.02. The optimal piezoelectric property of small‐signal d 33 is much enhanced to be 96 pC/N ( x = 0.01), which is higher than any other BKT‐based compositions. By the introduction of Bi ( Mg 2/3 Nb 1/3 ) O 3 , the ceramics exhibit a lower coercive field E C . In addition, a relaxor‐like behavior with a frequency‐dependent Curie temperature T m is observed, and high Curie temperature T m around 380°C is obtained in the investigated system. This study suggests that the piezoelectric properties of BKT can be significantly improved by the means of Bi ( Mg 2/3 Nb 1/3 ) O 3 substitution.

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