Nickel Nitride, Ni₂N

Nickel Nitride, Ni₂N (or Ni₄N₂), has been obtained by heating reduced nickel in a current of ammonia at about 500° C. It is also formed when nickelamide, Ni(NH₂)₂, is heated at 120° C. in a vacuum. Nickel nitride is a black powder, readily soluble in dilute hydrochloric or sulphuric acid, and completely decomposed when heated in hydrogen, its nitrogen being evolved as ammonia.