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The mixed alanate K 2 NaAlH 6 has been synthesised by ball-milling a mixture of KH and NaAlH 4 and subsequent annealing at 150°C under a stabilizing hydrogen pressure. It takes a cubic ordered perovskite-type structure (space group Fm3¯m, a=8.118(1)Å) where the ideal octahedral AlH 63− units form a cubic close-packed structure with K + in all tetrahedral...
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