Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O-3-CaZrO3 ceramics for piezo actuators

Authors
Lee, Ku-TakLee, Tae-GonKim, Sun-WooChae, Seok-JuneKim, Eun-JiKim, Jeong-SeogChoi, Ji-WonNahm, Sahn
Issue Date
2019-10
Publisher
WILEY
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.102, no.10, pp.6115 - 6125
Abstract
The 0.97(Na0.5K0.5)(Nb1-xSbx)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 degrees C owing to its low Curie temperature (T-C), 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 d(33) by increasing the T-C without degrading the actual d(33) and strain values. The 0.97(Li0.04Na0.46K0.5)(Nb0.89Sb0.11)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 degrees C and the d(33) slightly decreased to 475 pC/N at 130 degrees C. Therefore, this lead-free ceramic displays excellent piezoelectric characteristics with improved thermal stability, indicating that it can be applied to piezoelectric actuators.
Keywords
LEAD-FREE PIEZOCERAMICS; PHASE-BOUNDARY STRUCTURES; GIANT PIEZOELECTRICITY; DOMAIN CONFIGURATIONS; TEMPERATURE STABILITY; PERFORMANCE; TRANSITION; LEAD-FREE PIEZOCERAMICS; PHASE-BOUNDARY STRUCTURES; GIANT PIEZOELECTRICITY; DOMAIN CONFIGURATIONS; TEMPERATURE STABILITY; PERFORMANCE; TRANSITION; lead-free ceramics; phase transition; piezoelectric materials; properties; strain; thermal properties
ISSN
0002-7820
URI
https://pubs.kist.re.kr/handle/201004/119531
DOI
10.1111/jace.16503
Appears in Collections:
KIST Article > 2019
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