LAH crystallizes in the monoclinic space group P2₁/c.
The unit cell has the dimensions: a = 4.82, b = 7.81, and c = 7.92 Å, α = γ = 90° and β = 112°.
In the structure, Li⁺ centers are surrounded by five AlH⁻
₄ tetrahedra.
The Li⁺ centers are bonded to one hydrogen atom from each of the surrounding tetrahedra creating a bipyramid arrangement.
At high pressures (>2.2 GPa) a phase transition may occur to give β-LAH.
LAH crystallizes in the monoclinic space group P2₁/c. The unit cell has the dimensions: a = 4.82, b = 7.81, and c = 7.92 Å, α = γ = 90° and β = 112°. In the structure, Li⁺ centers are surrounded by five AlH⁻
₄ tetrahedra. The Li⁺ centers are bonded to one hydrogen atom from each of the surrounding tetrahedra creating a bipyramid arrangement. At high pressures (>2.2 GPa) a phase transition may occur to give β-LAH.
Lithium aluminium hydride