Figure 1.

Structures of AlH₃ polymorphs of $\mathsf{\alpha }-{\mathrm{AlH}}_3$, ${\mathsf{\alpha }}^{\prime }-{\mathrm{AlH}}_3$, $\mathsf{\beta }-{\mathrm{AlH}}_3$, $\mathsf{\gamma }-{\mathrm{AlH}}_3$. Reprinted with permission from Ref. [10]. Copyright 2009 Elsevier.