Phases of NH.sub.4 AlF.sub.4 and AlF.sub.3
AssigneeE. I. Du Pont de Nemours and Company
InventorsRichard L. Harlow, Norman Herron
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Abstract
New crystalline phases of the fluoroaluminum compounds NH.sub.4 AlF.sub.4 and AlF.sub.3 and processes for their preparation are disclosed.
Claims9
A compound comprising the beta phase of NH.sub.4 AlF.sub.4 having space group I4/mcm and having unit cell parameters of a equal to 11.64.ANG. (1.164 mm) and c equal to 12.66.ANG. (1.266 nm) at 25.degree. C.
A compound comprising the kappa phase of AlF.sub.3 having space group P4/mbm and unit cell parameters of a equal to 11.41.ANG. (1.141 nm) and c equal to 3.54.ANG. (0.354 nm).
A process for the preparation of the beta phase of NH.sub.4 AlF.sub.4 comprising reacting pyridineHAlF.sub.4 and formamide solvent.
A process for the preparation of the kappa phase of AlF.sub.3 comprising the pyrolysis of beta-NH.sub.4 AlF.sub.4.
A process for the preparation of the alpha phase of AlF.sub.3 comprising the pyrolysis of the kappa phase of AlF.sub.3.
Dependencies are inferred from the claim text.