NiMg2

NiMg2 is an intermetallic compound formed between nickel and magnesium. It crystallizes in the hexagonal Laves phase structure, specifically the Mg2Ni type, with the space group P63/mmc. This compound is a member of the Ni-Mg binary system, which exhibits a eutectic reaction at approximately 736°C and 68.5 at% Ni.

The synthesis of NiMg2 can be achieved through various methods, including arc melting, induction melting, and mechanical alloying. The resulting material is typically a brittle solid with a high melting point. NiMg2 has garnered interest due to its potential applications in hydrogen storage. It exhibits reversible hydrogen absorption and desorption properties at relatively low temperatures and moderate pressures, making it a candidate for solid-state hydrogen storage devices.

The hydrogen absorption mechanism in NiMg2 involves the formation of a hydride phase. The capacity and kinetics of hydrogen storage are influenced by factors such as particle size, microstructure, and the presence of dopants. Research continues to explore ways to optimize the hydrogen storage performance of NiMg2 and its alloys for practical applications. Beyond hydrogen storage, NiMg2 has also been investigated for its thermoelectric properties and as a component in magnetic materials, though these applications are less developed.