The color of langatate crystals and its relationship with composition and optical propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2014 г.
Аннотация:Langatate crystals grown by the Czochralski method in < 0001 > and < 01(1)over bar1 > 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 - V-O center dot center dot (0.35-0.36 mu m), the vacancies in the lanthanum position - V-La'" (0.29-0.30 mu m); the absorption band at 0.48-0.49 mu m 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)O-3 phase that has the structural and geometric agreement with langatate structure. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)