Abstract
Abstract Ca 19 Mg 8 H 54 and its deuteride have been synthesised at high pressure (25 kbar) and high temperature (850 K) from a 1:2 mixture of the binary Mg and Ca hydrides (deuterides). X-ray and neutron powder diffraction show a cubic Yb 19 Mg 8 H 54 type structure (space group Im 3 ) with cell parameters a =12.1457(6) A (hydride) and 12.0642(8) A (deuteride). The hydrogen storage densities (5.4 wt.%, 100.9 g/litre) are among the highest found so far for ternary alkaline earth or mixed alkali–alkaline earth metal hydrides. Desorption experiments suggest that the deuteride decomposes at ∼700 K and 5 bar deuterium pressure into Ca 4 Mg 3 D 14 and CaD 2 .
Published Version
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