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Enhanced piezoelectric properties and electrocaloric effect in novel lead‐free (Bi 0.5 K 0.5 )TiO 3 ‐La(Mg 0.5 Ti 0.5 )O 3 ceramics
Author(s) -
Li Feng,
Lu Biao,
Zhai Jiwei,
Shen Bo,
Zeng Huarong,
Lu Shengguo,
Viola Giuseppe,
Yan Haixue
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.15812
Subject(s) - materials science , phase boundary , piezoelectricity , raman spectroscopy , tetragonal crystal system , electrocaloric effect , phase transition , phase (matter) , analytical chemistry (journal) , piezoelectric coefficient , ceramic , crystal structure , ferroelectricity , crystallography , dielectric , thermodynamics , optoelectronics , composite material , chemistry , optics , physics , organic chemistry , chromatography
The crystal structure, electromechanical properties, and electrocaloric effect (ECE) in novel lead‐free (Bi 0.5 K 0.5 )TiO 3 ‐La(Mg 0.5 Ti 0.5 )O 3 ceramics were investigated. A morphotropic phase boundary ( MPB ) between the tetragonal and pseudocubic phase was found at x = 0.01‐0.02. In addition, the relaxor properties were enhanced with increasing the La(Mg 0.5 Ti 0.5 )O 3 content. In situ high‐temperature X‐ray diffraction patterns and Raman spectra were characterized to elucidate the phase transition behavior. The enhanced ECE (Δ T = 1.19 K) and piezoelectric coefficient ( d 33 = 103 pC/N) were obtained for x = 0.01 at room temperature. Meanwhile, the temperature stability of the ECE was considered to be related to the high depolarization temperature and relaxor characteristics of the Bi 0.5 K 0.5 TiO 3 ‐based ceramics. The above results suggest that the piezoelectric and ECE properties can be simultaneously enhanced by establishing an MPB . These results also demonstrate the great potential of the studied systems for solid‐state cooling applications and piezoelectric‐based devices.