Abstract
The tetrametaphosphates of the type Mn2−x Mg x P4O12, wherex=0 to 2, have been synthesized as new binary compounds, and their existence has been proved. The synthesis is based on a thermal procedure making use of the reversible transformation of tetrametaphosphates to higher linear phosphates. Temperatures and heats of formation of these products have been determined (i.e. formation by thermal recrystallization from higher linear phosphates) along with the yields of this procedure which increase with increasing magnesium content,x. The structure of the binary tetrametaphosphates belongs to the monoclinic system (over the whole range ofx); the structural parameters determined slowly decrease with increasing magnesium content. With respect to the proposed application of these products as special inorganic pigments, the following properties have also been determined experimentally: density, thermal stability, colour. With increasing magnesium content the density of these products slowly decreases and the melting temperatures increase; the intensity of pink hue is also changed with changing magnesium or manganese content.
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