Investigation of zirconia-germania glasses and solids prepared by sol-gel technique

Elena V. Frolova; Valerij S. Gurin; Lyudmila S. Ivashkevich; Vadim V. Sviridov

doi:10.1117/12.453597

23 October 2002 Investigation of zirconia-germania glasses and solids prepared by sol-gel technique

Elena V. Frolova, Valerij S. Gurin, Lyudmila S. Ivashkevich, Vadim V. Sviridov

Author Affiliations +

Proceedings Volume 4804, Sol-Gel Optics VI; (2002) https://doi.org/10.1117/12.453597
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

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Elena V. Frolova, Valerij S. Gurin, Lyudmila S. Ivashkevich, and Vadim V. Sviridov "Investigation of zirconia-germania glasses and solids prepared by sol-gel technique", Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); https://doi.org/10.1117/12.453597

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