INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Preparation and Micro-mechanism of High-TC and High Performance Piezoelectric Ceramics BNT-PZT |
JI Wanwan1, ZHANG Shuai1, LU Xiaolong1, FANG Bijun1, DING Jianning1,2
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1 School of Materials Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China 2 School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
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Abstract With the progress of science and technology, piezoelectric devices with high Curie-temperature (TC), excellent performance and high temperature stability are dramatically required in energy industry, aerospace industry and related fields. High TC piezoelectric ceramics Bi-(Ni1/2Ti1/2) O3-Pb (Zr1/2Ti1/2) O3 (BNT-PZT) were prepared by the solid-state method in this work. Via sintering processing optimization and composition selection, 0.25Bi (Ni1/2Ti1/2) O3-0.75Pb (Zr1/2Ti1/2) O3 (0.25BNT-0.75PZT) ceramics with composition around the morphotropic phase boundary (MPB) sintered at 1 090 ℃ for 2 h present excellent electrical performance and high stability below the TC temperatures, in which εm=18 944, TC=220.1 ℃, d33*=487.6 pm/V, d33=510 pC/N and Kp=59.8%. The ferroelectric phase transition mechanism of the 0.25BNT-0.75PZT ceramics was studied by temperature dependent Raman spectroscopy. Based on which low symmetric polar nano-regions or multi-phases coexistence is discovered. Electron back-scattered diffraction (EBSD) also discloses the existence of rhombohedral and tetragonal phases in micro-regions in the 0.25BNT-0.75PZT ceramics. The low symmetric polar nano-regions or multi-phases coexistence reduces the energy barrier of the crystalline lattice distortion and polarization rotation, contributing to the excellent electrical properties of the 0.25BNT-0.75PZT ceramics around MPB.
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Published: 06 November 2020
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Fund:National Natural Science Foundation of China (51577015), the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions and the Priority Academic Program Development of Jiangsu Higher Education Institutions. |
About author:: Wanwan Ji,received master degree in materials phy-sics and chemistry at Changzhou University. His research work focuses on high Curie-temperature piezoelectric ceramics. Bijun Fangis a professor of materials engineering in the School of Materials Science and Engineering at Changzhou University. He received Ph.D. degree in Engineering at Shanghai Institute of Ceramics of Chinese Academy of Sciences. His research work focuses on materials and devices of piezoelectric and ferroelectric ceramics and single crystals, nano functional materials and solvent hydrothermal synthesis. |
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