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Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O 3 ‐CaZrO 3 ceramics for piezo actuators
Author(s) -
Lee KuTak,
Lee TaeGon,
Kim SunWoo,
Chae SeokJune,
Kim EunJi,
Kim JeongSeog,
Choi JiWon,
Nahm Sahn
Publication year - 2019
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.16503
Subject(s) - materials science , orthorhombic crystal system , ceramic , piezoelectricity , thermal stability , tetragonal crystal system , phase boundary , strain (injury) , curie temperature , analytical chemistry (journal) , composite material , phase (matter) , mineralogy , crystal structure , crystallography , condensed matter physics , chemical engineering , chemistry , ferromagnetism , medicine , physics , organic chemistry , chromatography , engineering
The 0.97(Na 0.5 K 0.5 )(Nb 1−x Sb x )O 3 ‐0.03CaZrO 3 ceramic with x = 0.09 exhibits a high d 33 of 518 pC/N and a strain of 0.13% at 4.0 kV/mm owing to its orthorhombic‐pseudocubic polymorphic phase boundary (PPB) structure. However, these values decreased considerably above 90°C owing to its low Curie temperature ( T C ), indicating that its thermal stability is not sufficient for practical applications. Li 2 O was added to the specimen with x = 0.11 to improve its thermal stability of the strain and d 33 by increasing the T C without degrading the actual d 33 and strain values. The 0.97(Li 0.04 Na 0.46 K 0.5 )(Nb 0.89 Sb 0.11 )O 3 ‐0.03CaZrO 3 ceramic, having an orthorhombic‐tetragonal PPB structure, exhibits a d 33 of 502 pC/N and a strain of 0.16%. This large strain was maintained up to 150°C and the d 33 slightly decreased to 475 pC/N at 130°C. Therefore, this lead‐free ceramic displays excellent piezoelectric characteristics with improved thermal stability, indicating that it can be applied to piezoelectric actuators.