33.  New Single Crystals with Alpha-Quartz Structure Obtained by Hydrothermal Method

Authors: M. Miclau, A. Grozescu, R. Bucur, M. Poienar, P. Vlazan, I. Grozescu, N. Miclau, P. Barvinski


Abstract:

Interest of Si1-xGexO2 single crystal with alpha-quartz structure is connected to improvement of electromechanical coefficients and rise of α – β phase transition of quartz one. Growth of α -SixGe1-xO2 crystal was realized by a hydrothermal method of temperature gradient in autoclaves, made from Cr–Ni alloys. Nutrient material was prepared from synthetic quartz as crashed crystals or rods and placed in the bottom of autoclaves. There was loaded GeO2 powder additive in proportions to quartz nutrient. Single crystals were investigated by electron microprobe analysis, X-ray diffraction and atomic force microscopy. The most important result, which was obtained during the investigations, is an experimental proof of growth of SixGe1-xO2 solid solutions single crystals (with quartz structure) under the hydrothermal conditions. The present results thus open the possibility to tune the piezoelectric properties of these materials by varying the chemical composition.


Keywords: alpha-quartz, hydrothermal, piezoelectric

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