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Abstract

Various preparation routes led to a large number of complex ternary transition-metal hydrides and hydridometalates containing d- and f-elements, together with alkali, alkaline-earth, and rare-earth metals. Here, the parameter pressure is a crucial tool for the selective synthesis: increasing the reaction pressure leads to higher oxidation states of the transition element. The crystal structures of hydridometalates show a broad variety of different complex formations, whereby higher valence states of transition metals are favored, with alkali metal as the counterion. Moreover, the mobility of hydrogen atoms causes numerous order–disorder transitions.