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无机材料学报

无机材料学报

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准同型相界(MPB)附近BS-PT高温压电陶瓷研究

冯亚军, 徐 卓, 李振荣, 张 麟, 姚 熹   

  1. 西安交通大学电子陶瓷与器件教育部重点实验室, 西安 710049
  • 收稿日期:2005-08-08 修回日期:2005-10-25 出版日期:2006-09-20 网络出版日期:2006-09-20

High Temperature Piezoelectric Ceramics (1-x)BiScO3-xPbTiO3 Near the Morphotropic Phase Boundary (MPB)

FENG Ya-Jun, XU Zhuo, LI Zhen-Rong, ZHANG Lin, YAO Xi   

  1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2005-08-08 Revised:2005-10-25 Published:2006-09-20 Online:2006-09-20

PDF (PC)

2063

被引次数

31

摘要： (1-x)BiScO3-xPbTiO3陶瓷(简记BS-PT)在x=64.0%附近存在一个从菱方晶系过渡到四方晶系的准同型相界, 在此相界附近材料能获得优良的介电和压电性能. 本文选取PbTiO3含量在64.0%~65.5%的准同型相界附近的材料组分, 利用传统的固相烧结反应法合成了纯钙钛矿相结构的BS-PT陶瓷, 通过对材料的相结构形成过程和内部形貌分析以及对介电、压电性能的研究, 发现在x=64.%的组分条件下, BS-PT陶瓷材料获得了准同型相界范围内的最优的压电性能, 其室温压电常数d33可达500pC/N, 且居里温度(Tc)达到了438℃, 剩余极化强度和电致应变分别为44uC/cm2和3.5‰. 研究表明, 准同型相界附近的BS-PT陶瓷是一种优良的压电换能器和传感器材料.

关键词: BS-PT, 准同型相界, 高居里温度, 压电陶瓷

Abstract: (1-x)BiScO3-xPbTiO3 (BS-PT) ceramics exhibits excellent dielectric and piezoelectric properties in the vicinity of the morphotropic phase boundary (x=64.0% mol fraction PbTiO3), which separates the rhombohedral phase from tetragonal phase. In our study, the pure perovskite BS-PT ceramics was obtained with compositions near the MPB for x varying from 64.0% to 65.5% using traditional solid state reaction. The perovskite phase formation process and microstructure were investigated and also the dielectric and piezoelectric properties were studied. The results show that BS-PT ceramics with x=64.5% has an optimized piezoelectric characterization, its piezoelectric coefficient d33 can reach to as high as 500 pC/N at room temperature, the Curie temperature (Tc) can reach to 438℃, with the remnant polarization Pr=44μC/cm2, electrical field reduced strain 3.5‰. Our research results show that the BS-PT ceramics with the compositions near the morphotropic phase boundary is a good candidate material for the piezoelectric actuator and transducers.

Key words: BS-PT, morphotropic phase boundary, high Curie temperature, piezoelectric ceramics