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Nickel Sesquiselenide, Ni2Se3

Nickel Sesquiselenide, Ni2Se3, is obtained by exposing anhydrous nickel chloride to hydrogen selenide at dull red heat. Nickelo-nickelic Selenide, Ni3Se4, is obtained in the same way as a grey product apparently crystallising in the cubic system. The Diselenide, NiSe2, is a dark grey compound obtained by heating anhydrous nickel chloride in hydrogen selenide at 300° C.
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