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.