Cr+3 distribution in Al1 and Al2 Sites of alexandrite (BeAl2O4: Cr3+) induced by annealing, investigated by optical spectroscopy
Nenhuma Miniatura disponível
Data
2010
Autores
Trindade, Neilo M. [UNESP]
Scalvi, Rosa M. F. [UNESP]
Scalvi, Luis Vicente de Andrade [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
In order to investigate optical properties of alexandrite, the present work deals with the influence of thermal annealing on optical absorption and luminescence spectra of natural samples. The exposure time to heat treatment at 1000o C is taken into account. Possible migration of Cr3+ ions from Al1 (inversion site) to Al2 (reflection site) is detected. Sample composition is obtained through Scanning Electron Microscopy (SEM) measurements and points to a rearrangement of Cr+3 and Fe3+ ions in the alexandrite crystalline structure, under thermal annealing influence. This feature may be used to control the optical properties of natural alexandrite, which can be associated to the observed laser emission effect.
Descrição
Palavras-chave
A. oxides, D. optical properties, D. defects
Como citar
Energy and Power Engineering, v. 2, n. 2, p. 18-24, 2010.