摘要
本文作者测量了(28/0/100)PLZT 陶瓷的介电性能,获得了常温及液氮温度下的透射电子衍射象.首次在陶瓷材料中观察到电子波在材料中卫星环状漫散射现象.作者从晶体的衍射及漫散射理论出发,将获得的倒易空间信息还原到正空间.结合材料介电性能的测量,提出了(28/0/100)PLZT材料的低温相变模型.随着温度降低,材料中出现与基体共格的球形小区域,在球形小区域的周围出现具有方向性和周期性的晶格畸变.
We have measured the dielectric properties of PLZT(28/0/100)ceramics and have got thetransmit electron diffraction patterns at room temperature and liquid-nitrogen temperature.For the first time,we observed the ringlike Satellite diffusion of electron wave in ceramicsmaterials.According to the theories of diffraction and diffusion,we returned the K-space toreal space.Based on the measurement of dielectric properties,the low temperature phasetransformation mechanism is proposed to PLZT(28/0/100)ceramics.When temperature islowering,small spherical regions which have same lattice with base material appear in theceramics.There is lattice deformation which is orientated and periodic around these regions.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期313-317,共5页
Journal of Inorganic Materials
关键词
PLZT
陶瓷
电子衍射
显微结构
Ceramics
Electron deffraction
Microstructure
Diffuse phase transition
