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Nickel Diarsenide, NiAs2

Nickel Diarsenide, NiAs2, occurs in nature as chloanthite and Rammelsbergite. It may be prepared by heating nickel arsenide and arsenic in hydrogen at a decreasing temperature, being formed as a grey powder as the temperature falls below 400° C.

Stable Penta-nickel Diarsenide, Ni5As2, has been described.
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