Interaction of Hydrogen with Substitutional Solute Metals in the ß-Phase of the Palladium-Hydrogen System
Mössbauer data obtained with a number of resonances provide information on the local hydrogen distribution around more than a dozen substitutional solute elements in ß-PdHx. From these data and a model for the description of the line positions and intensities in the Mössbauer spectra, one can obtain the interaction energies of Co, Ru, Rh, Sn, Os, Ir, Pt and Au solutes with different nearest neighbor hydrogen configurations. Except for Rh, all these elements clearly repel hydrogen. The energies necessary to bring the first hydrogen atom into the nearest neighborhood of a solute were found to lie between about 20 meV for Ru and at least 150 meV for Au and Sn. For higher numbers of nearest neighbors the repulsive interaction per hydrogen usually becomes weaker, and in some cases the configurations with 5 or 6 nearest neighbors even seem to be energetically favored over those with only 3 or 4.
KeywordsHydrogen Concentration Isomer Shift Impurity Element Mossbauer Spectrum Probe Nucleus
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