PZN-BZN和PZN-BT陶瓷介电性能研究  

Dielectric properties of PZN-BZN and PZN-BT ceramics

作　　者：李亚兵[1] 王晓莉[1] 

机构地区：[1]西安交通大学理学院材料物理系,西安710049

出　　处：《功能材料与器件学报》2004年第2期215-220,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(No.50272052)

摘　　要：制备了Pb(Zn_(1/3)Nb_(2/3))O_3-Ba(Zn_(1/3)Nb_(2/3))O_3(PZN-BZN)和Pb(Zn_(1/3)Nb_(2/3))O_3-BaTiO_3(PZN-BT)两类PZN基弛豫型铁电陶瓷,系统地研究了它们的介电性能以及热处理工艺对其介电性能的影响。合成出具有100％钙钛矿相的0.9PZN-0.1BZN陶瓷,其最大介电常数为6160(1kHz)。对比这两个系统的介电性能发现,PZN-BT系中隐含的BZN组分对陶瓷性能有着重要影响。退火热处理能显著提高PZN基陶瓷相变温度附近的介电常数,但对样品的相变扩散和介电弛豫现象没有明显影响。Pb (Zn_(1/3)Nb_(2/3))O_3-Ba(Zn_(1/3)Nb_(2/3))O_3 (PZN-BZN) and Pb(Zn_(1/3)Nb_(2/3)O_3 - BaTiO_3(PZN-BT) relaxor ferroelectric ceramics were prepared by conventional ceramic processing routes. The dielectric properties of PZN-BZN and PZN-BT ceramics as well as the effects of heat treatment on dielectric property for PZN-based ceramics were systematically investigated. Pure perovskite phase was obtained in composition 0.9PZN-0.1BZN by solid-state reaction method. The maximal dielectrie constant K_m of 0.9PZN-0.1BZN ceramics reaches 6160(lkHz). Comparing dielectric properties of PZN - BZN and PZN-BT ceramics, it is found that BZN is an implicit component for PZN-BT system. The non-polar BZN component might make a notable impact on dielectric properties of PZNBT ceramics. The K_m of the all compositions increases after annealing, but heat treatment cannot change the relaxor characteristic of PZN-BZN and PZN-BT systems.

关 键 词：弛豫型铁电体 介电性能 退火 PZN-BZN PZN-BT 

分 类 号：TM22[一般工业技术—材料科学与工程]