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

Abstract:

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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.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 283-286)

Edited by:

Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar

Pages:

231-237

DOI:

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

Citation:

G. Mazzolai "Dynamics of Hydrogen in the Hexagonal (C14) Laves Phase Compounds TiCr1.8-xMnx", Defect and Diffusion Forum, Vols. 283-286, pp. 231-237, 2009

Online since:

March 2009

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