Dehydriding Property of LiBH4 Combined with Mg2FeH6

A dehydriding property of xLiBH(4) + (1 - x)Mg2FeH6 (x = 0.1-0.83) was investigated. The dehydriding reactions of pure LiBH4 and Mg2FeH6 start at approximately 650 and 450K, and 12.5 and 4.3 mass% hydrogen are released, respectively. The property drastically changes by combining LiBH4 and Mg2FeH6. Within the composition range 0.1 <= x <= 0.5, LiBH4 and Mg2FeH6 simultaneously release hydrogen. The reaction temperatures and quantities of released hydrogen alter with x. The lattice parameter of the Mg2FeH6 phase measured by in-situ high-resolution synchrotron diffraction measurements suggest the possibility of forming LixMg2-2x(BH4)(x)(FeH6)(1-x) with both double-cation and double-anion.