Lifetime spectra of positrons in lowly La-doped BaTiO<sub>3</sub>

Chaoqun Tang; Desheng Tan

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Lifetime spectra of positrons in lowly La-doped BaTiO₃

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- Lifetime spectra of positrons in lowly La-doped BaTiO₃
- Nuclear Techniques Vol. 12, Issue 3, (1989)
- 作者机构：
  
  华中工学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：19 October 1987，
  
  Published：1989-03
- 稿件说明：
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Chaoqun Tang, Desheng Tan. Lifetime spectra of positrons in lowly La-doped BaTiO₃[J]. Nuclear techniques, 1989, 12(3): 153-156.
DOI：

Chaoqun Tang, Desheng Tan. Lifetime spectra of positrons in lowly La-doped BaTiO₃[J]. Nuclear techniques, 1989, 12(3): 153-156. DOI：

摘要

本文报告了对低掺La的具有半导体化特性的BaTiO

陶瓷的正电子寿命研究。实验结果发现，正电子湮没参量随掺La量的变化有着奇特的现象：寿命τ

、τ

随掺La量的增加是先变小后又变大，而强度Ia随掺La量的增加则是先变大后又变小，它们的转折点相同。本文认为，转折点以前的变化是由于Ba空位随掺La量的增加而增加造成的。为解释转折点以后的变化，引入了复合缺陷（Ba空位与La杂质离子形成的复合体）模型，并得到复合缺陷是不能捕获正电子的结果。

Abstract

A study on positron lifetimes in lowly La-doped ceramic BaTiO

which has semi-conduction

is reported. The experiment results show that the lifetimes τ

and τ

decrease first and increase after

the intensity

increases first and decreases after with increasing amount of La

and these parameters turn at the same x value. The changes of

and

below the turn result from increasing of Ba vacancies with increasing La. To explain the results a complex defect (Ba vacancy+La ion complex) model was proposed. The experimental results show that this complex defect does not trap positrons.

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references

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H. A. Sauer et al . , J . Am . Ceram. Soc . , 43 （ 1960 ）, 6 : 297 .

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谭德生，硕士学位论文（华中工学院）， 1987 年，第27页。

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Lifetime spectra of positrons in lowly La-doped BaTiO3

DOI：

摘要

Abstract

关键词

Keywords

references

Lifetime spectra of positrons in lowly La-doped BaTiO₃