Vacancy defect positron lifetimes in strontium titanate

被引：60

作者：

Mackie, R. A. ^{[1
]}

Singh, S. ^{[1
]}

Laverock, J. ^{[2
]}

Dugdale, S. B. ^{[2
]}

Keeble, D. J. ^{[1
]}

机构：

[1] Univ Dundee, Sch Engn Phys & Math, Carnegie Lab Phys, Dundee DD1 4HN, Scotland

[2] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

ab initio calculations; niobium compounds; positron annihilation; strontium compounds; vacancies (crystal); DIELECTRIC-PROPERTIES; ELECTRONIC-STRUCTURE; GRADIENT-CORRECTION; THIN-FILMS; SRTIO3; ANNIHILATION; CHEMISTRY; DIFFUSION; LANTHANUM; CERAMICS;

D O I：

10.1103/PhysRevB.79.014102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The results of positron-annihilation lifetime spectroscopy measurements on undoped, electron-irradiated, and Nb-doped SrTiO3 single crystals are reported. Perfect lattice and vacancy defect positron lifetimes were calculated using two different first-principles schemes. The Sr-vacancy defect-related positron lifetime was obtained from measurements on Nb-doped, electron-irradiated, and vacuum-annealed samples. Undoped crystals showed a defect lifetime component dominated by trapping to Ti vacancy-related defects.

引用

页数：8

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