POSITRON-ANNIHILATION SPECTROSCOPY OF VACANCY AGGREGATES IN NEUTRON-IRRADIATED MGO CRYSTALS

被引：2
|
作者：
PAREJA, R
DELACRUZ, RM
GONZALEZ, R
CHEN, Y
机构：
[1] UNIV COMPLUTENSE MADRID,FAC CIENCIAS FIS,DEPT FIS MAT,E-28049 MADRID,SPAIN
[2] OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831
[3] US DOE,DIV MAT SCI,WASHINGTON,DC 20585
来源：
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 66卷 / 04期
关键词：
D O I：
10.1080/01418619208201578
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Positron annihilation measurements in neutron-irradiated MgO crystals show that the positron lifetime is shorter than in as-grown crystals, suggesting that most of the defects produced by neutron irradiations are positively charged. The concentration of the neutral anion vacancy (possibly also the neutral anion divacancy) is estimated to be no more than approximately 10(16) cm-3 for samples irradiated to a dose of 10(17) to 10(19) n cm-2. Annealing experiments on the neutron-irradiated crystals show a significant increase in the positron lifetime after anneals at 900 K. The increase is attributed to positron trapping by anion-vacancy aggregates. A lifetime of (284 +/- 15) ps is tentatively assigned to positrons trapped in these aggregates.
引用
收藏
页码：597 / 607
页数：11
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