Abstract
The interesting bonding, magnetic, and hydriding properties (1,2) of Y6Mn23 and Th6Mn23 are examined using Pauling’s metallic radii, polyhedral atomic volume (PAV), and partial coordination number coefficient (PCNC) calculations (3,4). The strong contraction that rare earth and early transition metals undergo in their formation of intermetallic compounds with small transition metals (3,5) is reversed upon hydride formation, suggesting that the latter process is partly driven by the compressed state of the large metal atom. This effect has been identified in LaNi5-type compounds (6), in TiFe and TiCu (5), and in Mg2Ni (7) and is investigated for the subject compounds. PAVs and valences for both selected Mn and H atoms suggest future areas for structure refinements.
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