Abstract
Mg 2RhH 1.1 is the first example for a hydrogen stabilized binary metal compound with filled Ti 2Ni-type structure. Its composition was refined from X-ray and neutron powder diffraction data on the deuteride and found to be Mg 2RhD 1.1. The deuterium atoms in the structure occupy octahedral holes formed by Mg atoms and tetrahedral holes formed by Mg and/or Rh atoms. Retrieval of hydrogen by desorption destabilizes the structure and leads to a hitherto unknown binary metal compound of composition Mg 2Rh which crystallizes with the Ti 2Pd-type structure, a branch of the MoSi 2-type structure.
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