Über das thermische Verhalten einiger Lithium-und Natriumhexafluorometallate(IV)

Thermal Behaviour of Some Lithium and Sodium Hexafluorometallates(IV) Rutile is formed by thermolysis from Li₂TiF₆ and on the other hand at first brookite originates from Na₂TiF₆. The nucleation of the final products is favoured not only by the similarity of the lattice geometries between initial product and final product but also by the chemical influences of small concentrations of defined impurities. The thermal behaviour of the lithium-and sodium haxafluorometalates A₂MF₆ (with M-element of the IV. main group) is compared among one another. The expansion of the lattices and the transformation of the phases are determined with the aid of the high-temperature-Guinier-method and some differences are shown to the same reactions in a great quantity of the substances. It is described γ-Na₂SnF₆ with a Na₂SiF₆ structure type.