✦ LIBER ✦

Nanocrystallization of amorphous zirconia-germania mixed oxides prepared by sol–gel technique

✍ Scribed by E.V. Frolova

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 229 KB
Volume: 23
Category: Article
ISSN: 0928-4931
DOI: 10.1016/j.msec.2003.09.097

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✦ Synopsis

The low-temperature preparation method based on organic-free sol -gel sequence has been elaborated for the binary oxide system ZrO 2 -GeO 2 . The coprecipitation method developed within the framework of the present work owing to the strong acid -base interaction of the components allowed to produce stable sols of the binary oxides with high dispersity and homogeneity. A usage of this method has extended the homogeneity range in the ZrO 2 -GeO 2 system up to the molar ratio ZrO 2 -GeO 2 = 24:76. A heat-treatment of ZrO 2 -GeO 2 xerogels (dried in air sols) resulted in transformation of amorphous materials into homogeneous nanocrystalline glass-ceramic composition. The earlier crystallization steps were detected with XRD, DTA, and IR spectroscopy. ZrO 2 -GeO 2 molar ratio was studied in the range 50:50 < ZrO 2 -GeO 2 < 24:76.

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