Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 12, Pages 17246-17252Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.02.284
Keywords
Potassium sodium niobate; Orthogonal-tetragonal phase; Strain properties
Categories
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Key Discipline of Materials Science and Engineering, Chizhou University [czxyylxk03]
- Anhui Province materials and chemical industry first-class undergraduate talents demonstration leading base [2020rcsfjd28]
- Key Laboratory of Micro-Nano Powder and Advanced Energy Materials of Anhui Higher Education Institutes
- Development Project of Anhui Province [201904a05020069]
- Key Project of Natural Science Research of Universities in Anhui Province [KJ2021A1133]
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In this study, (0.95-x)K0.48Na0.52NbO3-0.05SrTiO(3)-xCaZrO(3) piezoelectric ceramics were prepared and their microstructures, phase structures, and ferroelectric, dielectric, and strain properties were investigated. The crystal structure of the ceramics changed from orthogonal-tetragonal coexistence to tetragonal-orthogonal coexistence by improving the transition temperature with increasing CaZrO3 doping. These materials exhibited a high electric field-induced strain and excellent ferroelectric and dielectric properties, making them promising candidates for lead-free ceramics in the future.
Herein, (0.95-x)K0.48Na0.52NbO3-0.05SrTiO(3)-xCaZrO(3) piezoelectric ceramics were prepared using a conventional solid sintering process, and their microstructures, phase structures, and ferroelectric, dielectric, and strain properties were studied. The crystal structure of the ceramics changed from the coexistence of an orthogonal-tetragonal phase on the orthogonal side at x = 0 to that on the tetragonal side at x = 0.02 by improving the orthogonal-tetragonal transition temperature (similar to 20 degrees C) with increasing CaZrO3 (abbreviated as CZ) doping. A high electric field-induced strain of 0.33% with a Curie temperature of T-c = 256 degrees C was obtained at x = 0.02 and was approximately two times that observed at x = 0. The dielectric constant and maximum polarization were the highest at x = 0.02 in this (0.95-x)K0.48Na0.52NbO3-0.05SrTiO(3)-xCaZrO(3) system. These materials would be promising lead-free ceramics in the future.
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