Ni2N

Ni2N is a nickel nitride compound with the chemical formula Ni2N. It is one of several nitride phases formed between nickel and nitrogen and has appeared in multiple thin-film and bulk studies. The exact stoichiometry and crystal structure reported for Ni2N can vary, and non-stoichiometric Ni2+xN phases or mixed nitride phases are sometimes observed.

Synthesis of Ni2N can proceed through nitridation of nickel metal or nickel compounds in ammonia, nitrogen, or ammonium-containing environments at elevated temperatures. It can also be deposited as a thin film by reactive sputtering, chemical vapor deposition, or electrodeposition under nitrogen-containing atmospheres. Ni2N is often described as metastable, with possible transformation to Ni, Ni3N, or other nitride phases upon heating or prolonged exposure.

Structure and properties reported for Ni2N include several potential crystal arrangements depending on synthesis conditions; non-stoichiometry and defects are common. Owing to its nickel content, the material is expected to exhibit metallic conductivity and ferromagnetic behavior similar to nickel. The nitride matrix typically offers hardness and wear resistance, and chemical stability is moderate in nitrogen-containing environments.

Applications and research focus on Ni2N include potential catalytic activity for nitrogen-related reactions, such as ammonia synthesis or hydrogen evolution, and its use as a protective coating or in electronic and spintronic applications. Realizing practical use requires better control of phase stability and reproducibility.

Safety and handling considerations for nickel nitrides include standard precautions for solid nitrogen-containing compounds and avoidance of conditions that could promote hazardous decomposition.