Kinetics and thermodymamics of hydrogen absorption in the Zr(Al0.1Fe0.9)2 intermetallic compound

A. Israel; I. Jacob

doi:10.1016/S0925-8388(97)00130-8

Kinetics and thermodymamics of hydrogen absorption in the Zr(Al_0.1Fe_0.9)₂ intermetallic compound

A. Israel, I. Jacob

Unit of Nuclear Engineering

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

5 Scopus citations

Abstract

Thermodynamic and kinetic characteristics of hydrogen absorption in Zr(Al_0.1Fe_0.9)₂ were investigated at pressures up to 80 atm of H₂ and temperatures between 248 K and 270 K. The heat and entropy of formation of the Zr(Al_0.1Fe_0.9)₂ hydride are estimated to be -24.7 kJ/(mole H₂) and -120 J/(K*mole H₂), respectively. Small, well-defined samples were utilized for the kinetic research. The experimental kinetic data fit a shrinking core (sc) model, in accord with a visual examination of partly hydrided samples. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the hydride formation rate-determining step. The activation energy for the hydriding process is estimated from Arrhenius plots of the reaction rates to be 0.30 eV/H atom. The kinetic data are discussed in view of similar results for additional intermetallic compounds.

Original language	English
Pages (from-to)	131-134
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	260
Issue number	1-2
DOIs	https://doi.org/10.1016/S0925-8388(97)00130-8
State	Published - 1 Jan 1997

Keywords

Hydride formation
Thermodynamic and kinetic parameters
Zr(AlFe)2

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0925-8388(97)00130-8

Cite this

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title = "Kinetics and thermodymamics of hydrogen absorption in the Zr(Al0.1Fe0.9)2 intermetallic compound",

abstract = "Thermodynamic and kinetic characteristics of hydrogen absorption in Zr(Al0.1Fe0.9)2 were investigated at pressures up to 80 atm of H2 and temperatures between 248 K and 270 K. The heat and entropy of formation of the Zr(Al0.1Fe0.9)2 hydride are estimated to be -24.7 kJ/(mole H2) and -120 J/(K*mole H2), respectively. Small, well-defined samples were utilized for the kinetic research. The experimental kinetic data fit a shrinking core (sc) model, in accord with a visual examination of partly hydrided samples. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the hydride formation rate-determining step. The activation energy for the hydriding process is estimated from Arrhenius plots of the reaction rates to be 0.30 eV/H atom. The kinetic data are discussed in view of similar results for additional intermetallic compounds.",

keywords = "Hydride formation, Thermodynamic and kinetic parameters, Zr(AlFe)2",

author = "A. Israel and I. Jacob",

note = "Funding Information: This work was partly supported by a grant of the Israeli Council of Higher Education and the Israeli Atomic Energy Commission.",

year = "1997",

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doi = "10.1016/S0925-8388(97)00130-8",

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TY - JOUR

T1 - Kinetics and thermodymamics of hydrogen absorption in the Zr(Al0.1Fe0.9)2 intermetallic compound

AU - Israel, A.

AU - Jacob, I.

N1 - Funding Information: This work was partly supported by a grant of the Israeli Council of Higher Education and the Israeli Atomic Energy Commission.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - Thermodynamic and kinetic characteristics of hydrogen absorption in Zr(Al0.1Fe0.9)2 were investigated at pressures up to 80 atm of H2 and temperatures between 248 K and 270 K. The heat and entropy of formation of the Zr(Al0.1Fe0.9)2 hydride are estimated to be -24.7 kJ/(mole H2) and -120 J/(K*mole H2), respectively. Small, well-defined samples were utilized for the kinetic research. The experimental kinetic data fit a shrinking core (sc) model, in accord with a visual examination of partly hydrided samples. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the hydride formation rate-determining step. The activation energy for the hydriding process is estimated from Arrhenius plots of the reaction rates to be 0.30 eV/H atom. The kinetic data are discussed in view of similar results for additional intermetallic compounds.

AB - Thermodynamic and kinetic characteristics of hydrogen absorption in Zr(Al0.1Fe0.9)2 were investigated at pressures up to 80 atm of H2 and temperatures between 248 K and 270 K. The heat and entropy of formation of the Zr(Al0.1Fe0.9)2 hydride are estimated to be -24.7 kJ/(mole H2) and -120 J/(K*mole H2), respectively. Small, well-defined samples were utilized for the kinetic research. The experimental kinetic data fit a shrinking core (sc) model, in accord with a visual examination of partly hydrided samples. The pressure dependence of the rate constants indicates an interface-controlled phase transition as the hydride formation rate-determining step. The activation energy for the hydriding process is estimated from Arrhenius plots of the reaction rates to be 0.30 eV/H atom. The kinetic data are discussed in view of similar results for additional intermetallic compounds.

KW - Hydride formation

KW - Thermodynamic and kinetic parameters

KW - Zr(AlFe)2

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EP - 134

JO - Journal of Alloys and Compounds

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