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Zirconium diphosphide can be obtained from arc-melting of zirconium with red phosphorus:
2 Zr + P4 → 2 ZrP2
Physical properties
Zirconium diphosphide forms grey crystals that is insoluble in water. Zirconium diphosphide is very toxic. Has a lead(II) chloride crystal structure. It dissolves in warm concentrated sulfuric acid. It decomposes into phosphorus and ZrP when heated in vacuum: