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H-Diffusion in the H-Storage TiVMnCr Alloys as Deduced from Absorption and Mechanical Spectroscopy Experiments

Published online by Cambridge University Press:  01 February 2011

Giovanni Mazzolai ,
Andrea Biscarini ,
Bruno Coluzzi ,
Fabio Massimo Mazzolai  and
Ausonio Tuissi
Giovanni Mazzolai
Affiliation:
[email protected], University of Perugia, Department of Physics, Via A.Pascoli 5, Perugia, Perugia, 06126, Italy, +39-3381305695
Andrea Biscarini
Affiliation:
[email protected], University of Perugia, Department of Physics, Italy
Bruno Coluzzi
Affiliation:
[email protected], University of Perugia, Department of Physics
Fabio Massimo Mazzolai
Affiliation:
[email protected], University of Perugia, Department of Physics, Italy
Ausonio Tuissi
Affiliation:
[email protected], Istituto per l'energetica e le interfasi CNR-IENI,Lecco, Italy
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Abstract

The low H content portion of the PCT absorption curves of the 40Ti-xV-(50-x)Mn-10Cr alloys exhibits a plateau, whose pressure has been determined together with the solubility limit of H in the α–phase (solid solution). The chemical (Dc) and Einstein (DE) diffusion coefficients of H have been deduced from H absorption kinetics (273 K-1100 K) and from mechanical spectroscopy (150 K-200 K), which has revealed a Snoek-type of anelastic relaxation. The combined Arrhenius plot of DE and Dc gives the following parameters for H diffusion: W=0.318±0.005 eV, D0=(4±1)×10−7 m2/s (36 V alloy) and W=0.352±0.005 eV, D0=(5±1)10−7 m2/s (32 V alloy).

Keywords

diffusionabsorptionelastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 885: Symposium A – The Hydrogen Cycle – Generation, Storage and Fuel Cells , 2005 , 0885-A09-32
Copyright
Copyright © Materials Research Society 2006

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References

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