Kinetic Study of the Hydrogen Absorption in the Zr(AlXFe1-X)2 System

I. Jacob; N. Bronfman; M. H. Mintz; J. Bloch

doi:10.1524/zpch.1993.181.Part_1_2.289

Kinetic Study of the Hydrogen Absorption in the Zr(Al_XFe_1-X)₂ System

I. Jacob, N. Bronfman, M. H. Mintz, J. Bloch

Unit of Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The hydriding kinetic behavior of Zr(Al_xfe_1-x)₂, 0.5 ≤ x ≤0.75 specimens was examined at pressures up to 70 atm and temperatures up to 573 K. Quantitative information was obtained only for Zr(Al_0.5fe_0.5)₂ and partly for Zr(Al_0.6fe_0.4)₂. The results were interpreted in terms of a constant velocity movement of the hydride-metal boundary. A significant increase of the hydrogénation activation energy was found for Zr(Al_0.5fe_0.5)₂ and Zr(Al_0.6fe_0.4)₂ with respect to the previously investigated Zr(A_10.5Fe_0.5)2. This was manifested by a corresponding two order magnitude decrease of the hydride propagation velocities at room temperature. We regard the variation in hydriding kinetics, stability and hydrogen capacity across the Zr(Al_xfe_1-x)₂-H₂ system as an indication of a possible kinetic effect on the hydrogen absorption in the Al-rich compounds.

Original language	English
Pages (from-to)	289-297
Number of pages	9
Journal	Zeitschrift fur Physikalische Chemie
Volume	181
DOIs	https://doi.org/10.1524/zpch.1993.181.Part_1_2.289
State	Published - 1 Jan 1993

Keywords

Constant velocity movement of hydride-metal boundary
Hydriding kinetics and activation energy
ZrAlfe) intermetallic compounds

ASJC Scopus subject areas

Physical and Theoretical Chemistry

Access to Document

10.1524/zpch.1993.181.Part_1_2.289

Cite this

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title = "Kinetic Study of the Hydrogen Absorption in the Zr(AlXFe1-X)2 System",

abstract = "The hydriding kinetic behavior of Zr(Alxfe1-x)2, 0.5 ≤ x ≤0.75 specimens was examined at pressures up to 70 atm and temperatures up to 573 K. Quantitative information was obtained only for Zr(Al0.5fe0.5)2 and partly for Zr(Al0.6fe0.4)2. The results were interpreted in terms of a constant velocity movement of the hydride-metal boundary. A significant increase of the hydrog{\'e}nation activation energy was found for Zr(Al0.5fe0.5)2 and Zr(Al0.6fe0.4)2 with respect to the previously investigated Zr(A10.5Fe0.5)2. This was manifested by a corresponding two order magnitude decrease of the hydride propagation velocities at room temperature. We regard the variation in hydriding kinetics, stability and hydrogen capacity across the Zr(Alxfe1-x)2-H2 system as an indication of a possible kinetic effect on the hydrogen absorption in the Al-rich compounds.",

keywords = "Constant velocity movement of hydride-metal boundary, Hydriding kinetics and activation energy, ZrAlfe) intermetallic compounds",

author = "I. Jacob and N. Bronfman and Mintz, {M. H.} and J. Bloch",

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AU - Jacob, I.

AU - Bronfman, N.

AU - Mintz, M. H.

AU - Bloch, J.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - The hydriding kinetic behavior of Zr(Alxfe1-x)2, 0.5 ≤ x ≤0.75 specimens was examined at pressures up to 70 atm and temperatures up to 573 K. Quantitative information was obtained only for Zr(Al0.5fe0.5)2 and partly for Zr(Al0.6fe0.4)2. The results were interpreted in terms of a constant velocity movement of the hydride-metal boundary. A significant increase of the hydrogénation activation energy was found for Zr(Al0.5fe0.5)2 and Zr(Al0.6fe0.4)2 with respect to the previously investigated Zr(A10.5Fe0.5)2. This was manifested by a corresponding two order magnitude decrease of the hydride propagation velocities at room temperature. We regard the variation in hydriding kinetics, stability and hydrogen capacity across the Zr(Alxfe1-x)2-H2 system as an indication of a possible kinetic effect on the hydrogen absorption in the Al-rich compounds.

AB - The hydriding kinetic behavior of Zr(Alxfe1-x)2, 0.5 ≤ x ≤0.75 specimens was examined at pressures up to 70 atm and temperatures up to 573 K. Quantitative information was obtained only for Zr(Al0.5fe0.5)2 and partly for Zr(Al0.6fe0.4)2. The results were interpreted in terms of a constant velocity movement of the hydride-metal boundary. A significant increase of the hydrogénation activation energy was found for Zr(Al0.5fe0.5)2 and Zr(Al0.6fe0.4)2 with respect to the previously investigated Zr(A10.5Fe0.5)2. This was manifested by a corresponding two order magnitude decrease of the hydride propagation velocities at room temperature. We regard the variation in hydriding kinetics, stability and hydrogen capacity across the Zr(Alxfe1-x)2-H2 system as an indication of a possible kinetic effect on the hydrogen absorption in the Al-rich compounds.

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