高TC、高性能压电陶瓷BNT-PZT的制备及微观机制  

Preparation and Micro-mechanism of High-T C and High Performance Piezoelectric Ceramics BNT-PZT

作　　者：季万万 张帅 陆小龙 方必军 丁建宁 JI Wanwan;ZHANG Shuai;LU Xiaolong;FANG Bijun;DING Jianning(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;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]常州大学材料科学与工程学院,材料科学与工程国家级实验教学示范中心,江苏省光伏科学与工程协同创新中心,常州213164 [2]江苏大学机械工程学院,镇江212013

出　　处：《材料导报》2020年第20期20010-20014,共5页Materials Reports

基　　金：国家自然科学基金(51577015);江苏高校品牌专业建设工程;江苏高校优势学科建设工程。

摘　　要：随着科学技术的进步,能源、航天等领域对高居里温度(T C)、高性能、高稳定性压电器件有极大的需求。本工作通过固相法制备高T C压电陶瓷Bi(Ni 1/2 Ti 1/2)O 3-Pb(Zr 1/2 Ti 1/2)O 3(BNT-PZT)。通过工艺优化和组分调整发现,1090℃烧结2 h制备的准同型相界(MPB)附近组成的0.25Bi-(Ni 1/2 Ti 1/2)O 3-0.75Pb(Zr 1/2 Ti 1/2)O 3(0.25BNT-0.75PZT)陶瓷呈现出最佳的电学性能,且在T C以下具有很好的热稳定性:εm=18944,T C=220.1℃,d 33*=487.6 pm/V,d 33=510 pC/N,K p=59.8%。利用升温拉曼光谱研究了0.25BNT-0.75PZT陶瓷的铁电相变机理,发现陶瓷中存在低对称性极性纳米微区或多相共存;电子背散射(EBSD)分析证明0.25BNT-0.75PZT陶瓷的微区相结构为三方相和四方相共存。低对称性极性纳米微区或多相共存导致晶格畸变和极化旋转的能垒降低,使得MPB附近的0.25BNT-0.75PZT陶瓷具有优异的电学性能。With the progress of science and technology,piezoelectric devices with high Curie-temperature(T C),excellent performance and high temperature stability are dramatically required in energy industry,aerospace industry and related fields.High T C piezoelectric ceramics Bi-(Ni 1/2 Ti 1/2)O 3-Pb(Zr 1/2 Ti 1/2)O 3(BNT-PZT)were prepared by the solid-state method in this work.Via sintering processing optimization and composition selection,0.25Bi(Ni 1/2 Ti 1/2)O 3-0.75Pb(Zr 1/2 Ti 1/2)O 3(0.25BNT-0.75PZT)ceramics with composition around the morphotropic phase boundary(MPB)sintered at 1090℃for 2 h present excellent electrical performance and high stability below the T C temperatures,in whichεm=18944,T C=220.1℃,d 33*=487.6 pm/V,d 33=510 pC/N and K p=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.

关 键 词：钛镍酸铋-锆钛酸铅(BNT-PZT) 电学性能 铁电相变 拉曼光谱 电子背散射 

分 类 号：TQ174.75[化学工程—陶瓷工业]