Crystals of the title compound are grown by the method of spontaneous crystallization from melts in the system Na2O‐P2O5‐Cr2O3‐NaF.

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ChemInform Abstract The new title compound is obtained from a melt in the system Na2O-P2O5-Cr2O3-NaF at 950 rc C. It crystallizes in the tetragonal space group I4/mmm with Z=2. The structure consists of slightly distorted CrO4F2 octahedra. The oxygen atoms, which belong to neighboring PO4 tetrahedra, are in the equatorial plane of the octahedra, whose apices are occupied by fluorine atoms. Two of these octahedra are connected via common corners to form centrosymmetrical "dimers". The sodium atoms are statistically distributed in the cavities of the lattice.

Solid solutions based on Na 7 (InP 2 O 7 ) 4 PO 4 and Na 3 In 2 (PO 4 ) 3 , where chromium, iron, and man ganese substitute for indium, have been prepared. When chromium and iron substitute for indium in Na 7 (InP 2 O 7 ) 4 PO 4 , a continuous solid solution series exists. When manganese substitutes for indium, it enters the compound in the oxidation state +3. The substitution of chromium for indium in Na 3 In 2 (PO 4 ) 3 occurs within the range from 0.11 to 0.74 (mol/mol), and that of iron for indium, from 0.09 to 0.62 (mol/mol). When manganese substitutes for indium, it enters the structure of the crystalline phase in insignificant amounts as a two charged cation.