LiAl

LiAl, or lithium aluminide, is a binary intermetallic compound of lithium and aluminum with a near 1:1 stoichiometry. It is one of several intermetallic phases that form in the lithium–aluminum (Li–Al) system. In many studies, LiAl is described as adopting a CsCl-type (B2) crystal structure at room temperature, although other structures have been reported depending on synthesis and pressure conditions. The compound can be prepared by direct combination of elemental Li and Al at elevated temperature, typically under inert atmosphere to prevent corrosion and oxidation.

LiAl is primarily of interest in materials science and solid-state chemistry as a model system for studying lithium–metal bonding and diffusion in intermetallics, as well as as a potential intermediate in the processing of aluminum–lithium alloys. It has also been investigated in the context of hydrogen storage and reversible reactions involving lithium; however, LiAl is not itself a practical hydrogen storage material on its own in commercial applications.

Handling LiAl requires care because lithium-containing materials are highly reactive with air and moisture. It should be stored and handled under inert gas or vacuum and in facilities appropriate for reactive metals.

See also: lithium aluminum hydride LiAlH4; aluminum–lithium alloys; intermetallic compounds; CsCl structure.