Abstract
The change in hydrogen site energy with isotope for dihydrides and dideuterides of scandium and yttrium was indirectly determined using electron spin resonance (ESR) of erbium ions in dilute concentration in the f.c.c. hosts. The ESR spectra measure the distribution of hydrogen adjacent to the erbium; the variations in this distribution with isotope and with hydrogen-to-metal ratio were studied for several samples of both host metals. The data are accurately described by a lattice-gas model which yields the energy difference for protons or deuterons on octahedral and tetrahedral sites, both adjacent to the erbium impurities and in the bulk host lattice. This energy difference is 10% greater for deuterons, and the change with isotope can be attributed primarily to the mass dependence of the vibrational part of the total energy associated with each site.
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