The color of langatate crystals and its relationship with composition and optical properties

Autor:	Galina M. Kuz’micheva, S. S. Khasanov, A. B. Dubovsky, Alain Cousson, E. N. Domoroschina, I. A. Kaurova, Oksana Zaharko, Victor B. Rybakov
Rok vydání:	2012
Předmět:	Diffraction Materials science Annealing (metallurgy) Neutron diffraction chemistry.chemical_element General Chemistry Condensed Matter Physics Crystallographic defect Crystallography chemistry Absorption band X-ray crystallography Lanthanum General Materials Science Spectroscopy
Zdroj:	Crystal Research and Technology. 47:131-138
ISSN:	0232-1300
Popis:	Langatate crystals grown by the Czochralski method in 〈0001〉 and 〈011〉 directions both without subsequent annealing (from colorless to orange crystals) and with vacuum (colorless and pale-green crystals) and air (orange crystal) annealing have been investigated by neutron diffraction, X-ray diffraction and optical spectroscopy. The main types of point defects were compared with absorption bands: oxygen vacancies - VO•• (0.35-0.36 µm), the vacancies in the lanthanum position - VLa‴ (0.29-0.30 µm); the absorption band at 0.48-0.49 µm is typical for the colored samples. The relationship between the X color coordinate (red component) and the oxygen contents has been obtained. The green color of the sample annealed in vacuum is due to the presence of Ta+3 ions in the La(Ta3+,Ga)O3 phase that has the structural and geometric agreement with langatate structure. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze:	OpenAIRE
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