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Stability of Inorganic Fluorine‐Bearing Compounds: II, Complex Fluorides
Author(s) -
DEADMORE D. L.,
MACHIN J. S.,
ALLEN A. W.
Publication year - 1962
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1962.tb11098.x
Subject(s) - alkali metal , chemistry , fluorine , potassium , inorganic chemistry , fluoride , thermal decomposition , decomposition , hydrolysis , alkaline earth metal , thermal stability , alkaline hydrolysis , organic chemistry
The thermal stabilities of some alkali and alkaline‐earth fluosilicates and cuspidine when heated in atmospheres of dry and moist air were investigated. IN the decomposition of K 2 SiF 6 the compound K 3 SiF 7 was noted. The alkali and alkaline‐earth fluosilicates lose SiF 4 whereas cuspidine does not. In moist air atmospheres, α‐cristobalite is found among the residual products from the fluosilicates of sodium and potassium. K 2 TiF 6 hydrolyzes, first at low temperatures to an intermediate series of compounds and then at higher temperatures to fluorine‐free potassium titanates. Both K 2 ZrF 6 and Na 5 Zr 2 FI 3 hydrolyze to ZrO 2 and the alkali fluoride by way of an intermediate heptafluoride (M 3 ZrF 7 ).