摘要
研究了（Ba1-xSrx）（Zn1/3Nb2／3）O3（BSZN）固溶体系统在烧结中生成的第二相，分析了第二相的分布、形貌、形成规律、机理以及对介电性能的影响。研究表明，系统的主晶相为BSZN，同时生成了大量的第二相——Ba5Nb4O15、（Ba5-xSrx）Nb4O15（x=0～5）、Ba2Nb2O7、BaNb2O6等。第二相的生成是由于ZnO的挥发造成的；烧结温度越高、烧结时间越长，ZnO的挥发越多，第二相的含量也越多。第二相的形貌大部分为长方形的板状，样品的表面部分或完全被第二相所覆盖，且有少量呈粒状散布于晶粒之间。第二相的生成会对系统介质损耗产生不利的影响。
This paper studied secondary phases of （Ba1-xSrx）（Zn1/3 Nb2/3 ）O3 solid solutions system and analyzed its distributing, shape, law of form, mechanism and the effect on dielectric properties. The results showed that the main phase of system was BSZN, at the same time, lots of secondary phases： Ba5 Nb4 O15. （Ba5-x Srx）Nb4 O15 （x= 0 ～5）.Ba2Nb2O7 .BaNb2O6 et al, have come into being existence. It stats that the formation of secondary phases were caused by volatilization of ZnO. Higher sintering temperature and longer sintering time can cause much more volatilization of ZnO and more formation of secondary phases. The shape of secondary phases is mostly quadrate and the surface of samples is part or full covered with secondary phases, and a small quantity of them distribute in the crystal particles with graininess shape. Secondary phases have disadvantageous effect on the dielectric loss of system.
出处
《压电与声光》
CAS
CSCD
北大核心
2008年第3期311-314,共4页
Piezoelectrics & Acoustooptics
关键词
微波介质陶瓷
固溶体
第二相
机理
介电性能
microwave dielectric ceramics
solid solutions
secondary phases
mechanism
dielectric properties
