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.
Original language | English |
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Pages (from-to) | 6115-6125 |
Number of pages | 11 |
Journal | Journal of the American Ceramic Society |
Volume | 102 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2019 |
Keywords
- lead-free ceramics
- phase transition
- piezoelectric materials/properties
- strain
- thermal properties
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry