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Proceedings Paper

Investigation of zirconia-germania glasses and solids prepared by sol-gel technique
Author(s): Elena V. Frolova; Valerij S. Gurin; Lyudmila S. Ivashkevich; Vadim V. Sviridov
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Paper Abstract

Binary oxide solid products and glasses in the ZrO2-GeO2 system with the Ge:Zr molar ratio ranged from 1:1 to 3:1 were synthesized from inorganic precursors in aqueous medium by ammonia stimulated hydrolysis and coprecipitation. The latter were formed due to reaction of Zr(IV)+Ge(IV) solution with precipitating agent. The precipitated xerogels covered a color spectrum from white to red, and the color was more intense with increase of GeO2 content in the binary ZrO2-GeO2 composition. DTA, XRD, IR, and XPS were used for examination of crystalline structure and phase transformations in the coprecipitated amorphous xerogels and thermally treated ZrO2-GeO2 products. In samples with excess of germania in the binary ZrO2-GeO2 system both tetrahedral and octahedral coordination of Ge occur, resulting in different crystallization behaviors. In line with the stable ZrGe04 phase with scheelite structure we have established an appearance of new crystalline phase (called X-phase) for thermally treated (1000°C) samples with Ge:Zr = 2:1 and 3:1 rather than the hexagonal GeO2 phase.

Paper Details

Date Published: 23 October 2002
PDF: 11 pages
Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); doi: 10.1117/12.453597
Show Author Affiliations
Elena V. Frolova, Belarusian State Univ. (Belarus)
Valerij S. Gurin, Belarusian State Univ. (Belarus)
Lyudmila S. Ivashkevich, Belarusian State Univ. (Belarus)
Vadim V. Sviridov, Belarusian State Univ. (Belarus)

Published in SPIE Proceedings Vol. 4804:
Sol-Gel Optics VI
Edward J. A. Pope; Helmut K. Schmidt; Bruce S. Dunn; Shuichi Shibata, Editor(s)

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