ChemInform Abstract: Hafnium Germanate from a Hydrous Hafnium Germanium Oxide Gel.

✍ Scribed by P. M. LAMBERT

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 33 KB
• Volume: 29
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199822028

✦ Synopsis

Hafnium Germanate from a Hydrous Hafnium Germanium Oxide Gel.

-The exploitation of the enhanced solubility of hexagonal GeO 2 in dilute ammoniacal solutions provides a high-yield preparation of a precipitated hydrous precursor for HfGeO 4 . The precursor gel is shown to be a mixture of hydrous hafnia and an ammonium germanate gel. Thermal treatment drives the crystallization of a hafnium-rich, simple tetragonal Hf 1-x GexO 2 phase at 893 • C, that upon further heating to 1200 • C affords scheelite HfGeO 4 , which is a potential X-ray phosphor for conventional radiography. -(LAMBERT, P.