Vacancy-Mediated NiAs–Ni2In-Type Intermetallic Phases : Ni1+δ(In/Sb)
Ni1+δSn (δ = 0.2, 0.4) and Ni1+δ(In/Sb) (δ = 0.1–0.5) (NiAs/Ni2In type) were synthesized, and their crystal structures were studied in this report. In Ni1+δ(In/Sb), the excess nickel atoms (δ = 0.1–0.5) occupy the vacant trigonal bipyramidal interstitial sites in the NiAs-type structural arrangement, leading to the evolution of a fully disordered to ordered superstructure through a series of incom
