Abstract
Thermal stability of the phase composition of langasite family crystals is studied by means of high-temperature X-ray diffractometry upon heating in vacuo and in air. Upon heating above 1000°C in vacuo, the partial decomposition of the initial phase is observed in La3Ga5SiO14, La3Ta0.5Ga5.5O14, and Ca3TaGa3Si2O14 crystals; this is accompanied by the emergence of gallium-depleted oxides of the main elements, due to the formation of volatile gallium protoxide and the loss of gallium in the surface layer of the crystals. Langasite family crystals are found to be stable when annealed in air up to a temperature of 1200°C.
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Original Russian Text © O.M. Kugaenko, S.S. Bazalevskaya, T.B. Sagalova, V.S. Petrakov, O.A. Buzanov, S.A. Saharov, 2014, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2014, Vol. 78, No. 10, pp. 1322–1329.
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Kugaenko, O.M., Bazalevskaya, S.S., Sagalova, T.B. et al. High-temperature stability of the phase composition of langasite family crystals. Bull. Russ. Acad. Sci. Phys. 78, 1067–1074 (2014). https://doi.org/10.3103/S106287381410013X
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DOI: https://doi.org/10.3103/S106287381410013X