Preparation and properties of aluminum hydride

Abstract

Six crystalline phases of nonsolvated aluminum hydride were prepared by desolvation of AIH3 etherate in the presence of small amounts of LÍAIH4. The most stable phase, a-AlHj, was prepared both from the solid metastable phases and by crystallizing directly from a refluxing diethyl ether-benzene solution. Both the thermal stability and ease of preparation of aluminum hydride phases are highly dependent upon purity.Aluminum hydride (alane) was first reported as an impure solid* and subsequently as amine2"4 or ether complexes.5 A convenient synthesis of aluminum trihydride diethyletherate was developed by Finholt, Bond, and

Aluminum Hydride, A1h3, as a Hydrogen Storage Compound.

“…However, with the addition of LiA1H4 the peaks become well separated and the release of the solvent occurs at a slightly lower temperature. As originally noted by Brower et al [2], the addition of LiA1H4, or other complex metal hydride, lowers the desolvation temperature sufficiently to isolate the y or fi phases prior to decomposition.…”

“…It was first prepared in an ether solvated form by Finholt et al [I]. Non-solvated AlH3 was prepared Brower et al [2] using an organometallic synthesis route. They noted the existence of at least 7 non-solvated phases, namely a , a ' , 8, y , 6 , E and <.…”

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

“…SrD 2 as the starting material was synthesised from dendritic pieces of Sr (Sigma-Aldrich, St. Louis, MO, USA, 99.99%) at 673 K for 10 h in a deuterium gas pressure of 0.5 MPa. AlD 3 as the starting material was synthesised in diethyl ether according to the chemical reaction of LiAlD 4 and AlCl 3 [15,16]. The mixture of SrD 2 and AlD 3 was ball-milled at 400 r.p.m.…”

Heat capacity of α-AlH3and α-AlD3at temperatures up to 1000 K

“…The AlH 3 powder with a grain size of 30 μm and a purity of 99.8 wt% was produced by a reaction of LiAlH 4 with AlCl 3 in ether solution at room temperature [7]. The AlD 3 powder with a grain size of 20 μm was prepared in the same way using the deuterium-substituted reagents.…”