Lee, Ku-Tak Lee, Tae-Gon Kim, Sun-Woo Chae, Seok-June Kim, Eun-Ji Kim, Jeong-Seog Choi, Ji-Won Nahm, Sahn 2024-01-19T19:03:41Z 2024-01-19T19:03:41Z 2021-09-04 2019-10 0002-7820 https://pubs.kist.re.kr/handle/201004/119531 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. English WILEY LEAD-FREE PIEZOCERAMICS PHASE-BOUNDARY STRUCTURES GIANT PIEZOELECTRICITY DOMAIN CONFIGURATIONS TEMPERATURE STABILITY PERFORMANCE TRANSITION Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O-3-CaZrO3 ceramics for piezo actuators Article 10.1111/jace.16503 1 JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.102, no.10, pp.6115 - 6125 JOURNAL OF THE AMERICAN CERAMIC SOCIETY 102 10 6115 6125 scie scopus 000478649200041 2-s2.0-85065259102 Materials Science, Ceramics Materials Science Article 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