Dynamics of Hydrogen in the Hexagonal (C14) Laves Phase Compounds TiCr1.8-xMnx

Giovanni Mazzolai

doi:10.4028/www.scientific.net/DDF.283-286.231

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 283-286Dynamics of Hydrogen in the Hexagonal (C14) Laves...

Dynamics of Hydrogen in the Hexagonal (C14) Laves Phase Compounds TiCr_1.8-xMn_x

Abstract:

The diffusion of hydrogen has been investigated in the AB2 Laves phase Compounds TiCr1.78 and TiCr1.4Mn0.4, by absorption techniques. It has been found that H at temperatures higher than 700 K diffuses through the classical over-barrier mechanism, while at low temperature (around 100 K) the diffusion is governed by phonon-assisted tunnelling. The activation energy for classical hopping is rather high and increases with the substitution of Mn for Cr. In the range of H contents nH investigated (nH=H/Me0.03) the chemical diffusion coefficient does not depend on the H concentration.