Abstract
A geometric model has been applied to the η-carbides Zr3V3ODx, which belong to space group Fd3m. With criteria of minimum hole size and minimum distance between deuterium atoms and with the assumption that the larger interstices are preferred, it was possible to rationalize the experimentally observed preference, in decreasing order, for 32e sites, 192i sites, 96g1, and 96g2 sites. The respective numbers of coordinating metal atoms for these interstices are Zr3V, Zr2V2, Zr3V, and ZrV3. The largest interstices, which are the octahedral 8a sites with Zr6 coordination, remain empty for x=1.86, 2.85, and 4.93 because of their proximity to the more numerous 32e sites. The failure of deuterium atoms to occupy any 96g1 (Zr3V) sites at x=1.86 may indicate the existence of a short-range repulsive interaction between oxygen and deuterium. The possibilities for achieving higher values of x are also explored.
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