Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O3­CaZrO3 ceramics for piezo actuators

Title
Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O3­CaZrO3 ceramics for piezo actuators
Authors
최지원남산이규탁이태곤김선우채석준김은지김정석
Keywords
lead­free ceramics; phase transition; piezoelectric materials/properties; strain; thermal properties
Issue Date
2019-10
Publisher
Journal of the American Ceramic Society
Citation
VOL 102, NO 10-6125
Abstract
The 0.97(Na0.5K0.5)(Nb1− xSbx)O3‐ 0.03CaZrO3 ceramic with x = 0.09 exhibits a high d33 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 (TC), indicating that its thermal stability is not sufficient for practical applications. Li2O was added to the specimen with x = 0.11 to improve its thermal stability of the strain and d33 by increasing the TC without degrading the actual d33 and strain values. The 0.97(Li0.04Na0.46K0.5)(Nb0.89Sb0.11)O3‐ 0.03CaZrO3 ceramic, having an orthorhombic‐ tetragonal PPB structure, exhibits a d33 of 502 pC/N and a strain of 0.16%. This large strain was maintained up to 150°C and the d33 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.
URI
http://pubs.kist.re.kr/handle/201004/69727
ISSN
0002-7820
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