Tags: Chemical Compound, Chemical Substance.
Nickel selenide is the inorganic compound with the formula NiSe. As for many metal chalcogenides the phase diagram for nickel selenide is complicated. Two other selenides of nickel are known NiSe2 with a pyrite structure and Ni2Se3. Additionally NiSe is usually nonstoichiometric and is often described with the formula Ni1-xSe with 0 < x <0.15. These materials are all black semi-conducting solids when obtained as fine powders and silvery materials when obtained as larger crystals.
