Nickel(III) oxide, also known as nickel trioxide, is a chemical compound with the formula Ni₂O₃. It is an oxide of nickel in which nickel has an oxidation state of +3. This compound is characterized by its dark green to black appearance and is less common than the more stable Nickel(II) oxide (NiO). Nickel(III) oxide can be produced through various methods, including the oxidation of nickel compounds at high temperatures or through specific chemical reactions.
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