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Abstract : Isotope effects in transition metal hydrides can be related to a different crystalfield stabilization for H and D atoms at tetrahedral or octahedral interstices. Metals with low electronegativity or electron work function exhibit the normal isotope effect with a lower superconducting temperature for the deuteride, a higher activation energy of diffusion and higher temperature for the miscibility gap of the α-phase. Metals with an electronegativity larger than about 4.5 V exhibit the reverse behaviour. The relative volume expansion can be related to the electronegativity and is somewhat smaller for the deuterated sample.





Autor: J. Hauck

Fuente: https://hal.archives-ouvertes.fr/



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