Thermal stability of potassium fluorooxalatozirconates

Thermal decomposition of fluorooxalatozirconates (FOxZs) K 3 ZrF 5 C 2 O 4 , K 2 ZrF 4 C 2 O 4 ⋅ 2H 2 O, KZrF 3 C 2 O 4 ⋅ 3H 2 O, and Zr 4 O 3 F 2 (C 2 O 4 ) 4 ⋅ 2H 2 O in air flow is studied. Crystalline K 2 ZrF 4 C 2 O 4 and KZrF 3 C 2 O 4 are detected. The decomposition onset temperature of anhyd...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2017-06, Vol.62 (6), p.827-835
Main Authors: Godneva, M. M., Mikhailova, N. M., Kuznetsov, V. Ya, Zalkind, O. A.
Format: Article
Language:English
Subjects:
Air flow
Chemistry
Chemistry and Materials Science
Crystal structure
Disproportionation
Fluorine
Inorganic Chemistry
Physical Methods of Investigation
Potassium
Thermal decomposition
Thermal stability
Zirconium dioxide
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Summary:Thermal decomposition of fluorooxalatozirconates (FOxZs) K 3 ZrF 5 C 2 O 4 , K 2 ZrF 4 C 2 O 4 ⋅ 2H 2 O, KZrF 3 C 2 O 4 ⋅ 3H 2 O, and Zr 4 O 3 F 2 (C 2 O 4 ) 4 ⋅ 2H 2 O in air flow is studied. Crystalline K 2 ZrF 4 C 2 O 4 and KZrF 3 C 2 O 4 are detected. The decomposition onset temperature of anhydrous products goes down as the K/Zr molar ratio decreases. Disproportionation of potassium FOxZs both at the oxalate group yielding K 2 ZrF 4 C 2 O 4 and ZrO 2– x /2 F x , K 2 C 2 O 4 and K 3 ZrF 7 and at fluorine yielding K 3 ZrF 7 and ZrO 2 takes place. FOxZs can be used as precursors to produce fine-grained ZrO 2 (baddeleyite).
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023617060079