Binary cyclotetraphosphates Co 2− xNi xP 4O 12 and Mn 2− xNi xP 4O 12 as colour thermostable products

Abstract

Cyclotetraphosphates ( tetrametaphosphates ) of the type Co 2− x Ni x P 4O 12 and Mn 2− x Ni x P 4O 12, where Xϵ(0;2), have been synthesized as new binary compounds. The synthesis is based on a thermal procedure making use of the reversible transformation of Cyclotetraphosphates to higher linear phosphates. Temperatures of formation of these products have been determined (i.e. formation by thermal recrystallization from higher linear phosphates) together with the yields using this procedure; yields increase with increasing x (the nickel content). The structure of the products and the structural parameters have been determined. With respect to the proposed application of these products as special inorganic pigments, the density, thermal stability and colour of the compounds were determined.