材料科学
正电子湮没
消灭
兴奋剂
杂质
晶体缺陷
陶瓷
压电
格子(音乐)
钙钛矿(结构)
凝聚态物理
俘获
正电子
光电子学
结晶学
复合材料
核物理学
物理
化学
电子
生物
量子力学
声学
生态学
作者
HE Yuan-jin,Ma Xing-kun,Zhilun Gui,Longtu Li
出处
期刊:Chinese Physics
[Science Press]
日期:1998-01-01
卷期号:47 (1): 146-146
被引量:2
摘要
A systematic investigation of different types of lattice defects in intentionally doped or impurity substituted piezoelectric ceramics was carried out by using positron annihilation.La3+ doped PbTiO3,Sr2+,Cd2+,and La3+ doped Pb (Mg1/3Nb2/3)0.375Ti0.375Zr0.25O3;Ca2+ doped BaTiO3; and Nb5+ doped SrTiO3 were chosen as testing materials.It was found that positrons can be traped by cation vacancies,oxygen vacancies,as well as defects associated with lattice deformations,but with different dynamic specific trapping rates and annihilation characteristics.A new possible method for determining the defect species in perovskite structured piezoelectric ceramics is presented.
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