期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 13, 页码 5675-5683出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.05.050
关键词
Textured ceramics; Phase field simulation; Tape casting; Ferroelectric
资金
- National Natural Science Foundation of China [52102138]
- Fundamental Research Program of Shanxi Province [202103021224080]
A phase-field model was used to simulate the evolution of grain microstructure in textured ceramics. Textured KSr2Nb5O15 (KSN) ceramics were prepared with acicular KSN particles as raw materials. The effects of initial particle length distribution and diameter on grain growth behavior and electrical properties were investigated. It was found that the influence of initial particle length distribution on grain growth rate mainly depended on its diameter. The use of coarse particles was beneficial in obtaining a microstructure with strongly anisotropic morphology and homogeneous grain size. The obtained KSN ceramics exhibited a high piezoelectric constant and Curie temperature, which were closely related to the grain microstructure.
A phase-field model was employed to simulate the grain microstructure evolution of the textured ceramics. Textured KSr2Nb5O15 (KSN) ceramics were chosen as the research object and prepared by using acicular KSN particles as raw materials. A method combining the brush technique with the rolling process was proposed for the directional arrangement of the acicular particles. The effects of the initial particle length distribution and diameter on the grain growth behavior and electrical properties were investigated. It was found the influence of the initial particle length distribution on the grain growth rate mainly depended on its diameter. The use of coarse particles was beneficial to obtain a microstructure with a strongly anisotropic morphology and homogeneous grain size. The obtained KSN ceramics exhibited a high piezoelectric constant d(33) of 68 pC/N and Curie temperature of 120 ?, which was closely related to the grain microstructure.
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