Abstract
The influence of the strain state on the thermodynamics of hydrogenin quasi-two-dimensional potentials is reported. The host latticeis V embedded in Fe in the form of a Fe/V(001) superlattice, whichrepresents a strongly confined absorption potential extending overjust 13 monolayers. ΔH̄H and ΔS̄H for the continuous solubility region are calculatedfrom the measured isotherms. Two phase transitions are observed foratomic ratios up to c = 1 in the temperature region50-300 °C. The first transition occurs in the range 0.03⩽c⩽0.07, and shows a Curie-Weiss behaviour. Nocorresponding phase boundary exists in bulk vanadium hydrides. Thesecond transition, at c≃0.35 and T<150 °C, exhibitslarge hysteresis and involves an ordering not previously observed inthin vanadium layers. The site blocking at low concentrationsscales linearly with the initial strain and yields a blocking concentrationof c = 0.083(1) at zero strain, as compared to 0.415(9) in bulk V.This difference is ascribed to the finite-size of the hostlattice.
Published Version
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