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High Pressure Research
An International Journal
Volume 20, 2001 - Issue 1-6
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Original Articles

Growth and piezoelectric characterisation of GeO2 single crystals with quartz structure

, , , , &
Pages 185-194 | Received 10 Jan 2000, Accepted 25 Feb 2000, Published online: 19 Aug 2006
 

Abstract

The first results for growth of germanium dioxide single crystals with the crquartz type structure (α-GeO2) from refluxed hydrothermal solutions are reported. The success of this method is due to the existence of metastable α-GeO2 in aqueous solutions at relatively low temperature and to the structural similarity between α-GeO2 and α-SiO2. The continuous partial evaporation of the heated solvent, vapour condensation, saturation of the condensate by nutrient α-GeO2 and growth of α -GeO2 single crystals on quartz seeds are considered as the successive stages of the process. Mzre homogeneous crystals of α -GeO2 were obtained on seeds parallel to {0001}, {1120} and {1121} faces using sodium hydroxide and ammonium fluoride solutions in the range of temperature 90-130°C and at pressure equivalent to the fugacity of saturated vapor.

Piezoelectric, elastic and dielectric properties of the mentioned above crystals for the first time were studied.

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