A partial study of the Li20-P20 s and ZnO-P205 binary diagrams led to establishment of the polymorphism of Li3PO 4 and of Zn3(PO4) 2. Three crystalline forms wer~ found for Li3PO4, differring from one another only on the cation distribution at the tetrahedral sites of the almost hexagonal compact arrangement of the anions. Li3PO 4 differs from the isostructural compounds Li3VO 4 and Li3AsO 4 in its irreversible transformation at low temperature. Zna(POa) 2 is dimorphic, with a reversible transformation. It displays a slight non-stoichiometry through a ZnO deficiency.
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