Oxidation/reduction effects on the thermoluminescence of alpha-Al2O3 single crystals

Authors
Molnar, G Borossay, J Benabdesselam, M Iacconi, P Lapraz, D Suvegh, K Vertes, A
Citation
G. Molnar et al., Oxidation/reduction effects on the thermoluminescence of alpha-Al2O3 single crystals, PHYS ST S-A, 179(1), 2000, pp. 249-260
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
ISSN journal
00318965 → ACNP
Volume
179
Issue
1
Year of publication
2000
Pages
249 - 260
Database
ISI
SICI code
0031-8965(20000516)179:1<249:OEOTTO>2.0.ZU;2-I
Abstract
alpha-Al2O3 crystals were treated in different atmospheres (reducing/oxidis ing) at high temperature and their optical, positron-annihilation and therm oluminescent (TL) properties were investigated. From optical absorption and positron-annihilation spectra we concluded that aluminium-vacancies were c reated while oxygen-vacancies were destroyed in oxidised samples indicating a Schottky-type disorder. Structural changes were correlated with TL glow curves and the origin of some TL peaks was explained.