Vanadium activity measurement in fcc phase Pt-V alloy

Dong Hwi Park; Ji Seok Jeong; Sang Chul Shim; Joonho Lee

doi:10.1016/j.jallcom.2019.02.313

Vanadium activity measurement in fcc phase Pt-V alloy

Dong Hwi Park, Ji Seok Jeong, Sang Chul Shim, Joonho Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

Abstract

The temperature dependence of the thermodynamic properties of V, in Pt-V alloy, was investigated in this study. A Pt strip was equilibrated with V ₂ O ₃ powder, under controlled oxygen partial pressure and temperature. The mole fraction of V in the sample was measured with an electron probe micro-analyzer, and the activity coefficient of V was determined as a function of temperature and composition. With increasing temperature, the activity coefficient of V (γ _V ) increased. The activity coefficient at infinite dilution (γ _V ^o ) increased and the interaction parameter (ε _V ^V ) decreased with rising temperature. The excess Gibbs energy value for the fcc phase Pt-V alloy was strongly negative.

Original language	English
Pages (from-to)	967-971
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	788
DOIs	https://doi.org/10.1016/j.jallcom.2019.02.313
Publication status	Published - 2019 Jun 5

Keywords

Activity coefficient
Excess Gibbs energy
Pt-V alloy
Thermodynamics

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2019.02.313

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Park, D. H., Jeong, J. S., Shim, S. C., & Lee, J. (2019). Vanadium activity measurement in fcc phase Pt-V alloy. Journal of Alloys and Compounds, 788, 967-971. https://doi.org/10.1016/j.jallcom.2019.02.313

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abstract = " The temperature dependence of the thermodynamic properties of V, in Pt-V alloy, was investigated in this study. A Pt strip was equilibrated with V 2 O 3 powder, under controlled oxygen partial pressure and temperature. The mole fraction of V in the sample was measured with an electron probe micro-analyzer, and the activity coefficient of V was determined as a function of temperature and composition. With increasing temperature, the activity coefficient of V (γ V ) increased. The activity coefficient at infinite dilution (γ V o ) increased and the interaction parameter (ε V V ) decreased with rising temperature. The excess Gibbs energy value for the fcc phase Pt-V alloy was strongly negative. ",

keywords = "Activity coefficient, Excess Gibbs energy, Pt-V alloy, Thermodynamics",

author = "Park, {Dong Hwi} and Jeong, {Ji Seok} and Shim, {Sang Chul} and Joonho Lee",

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AU - Park, Dong Hwi

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AU - Shim, Sang Chul

AU - Lee, Joonho

PY - 2019/6/5

Y1 - 2019/6/5

N2 - The temperature dependence of the thermodynamic properties of V, in Pt-V alloy, was investigated in this study. A Pt strip was equilibrated with V 2 O 3 powder, under controlled oxygen partial pressure and temperature. The mole fraction of V in the sample was measured with an electron probe micro-analyzer, and the activity coefficient of V was determined as a function of temperature and composition. With increasing temperature, the activity coefficient of V (γ V ) increased. The activity coefficient at infinite dilution (γ V o ) increased and the interaction parameter (ε V V ) decreased with rising temperature. The excess Gibbs energy value for the fcc phase Pt-V alloy was strongly negative.

AB - The temperature dependence of the thermodynamic properties of V, in Pt-V alloy, was investigated in this study. A Pt strip was equilibrated with V 2 O 3 powder, under controlled oxygen partial pressure and temperature. The mole fraction of V in the sample was measured with an electron probe micro-analyzer, and the activity coefficient of V was determined as a function of temperature and composition. With increasing temperature, the activity coefficient of V (γ V ) increased. The activity coefficient at infinite dilution (γ V o ) increased and the interaction parameter (ε V V ) decreased with rising temperature. The excess Gibbs energy value for the fcc phase Pt-V alloy was strongly negative.

KW - Activity coefficient

KW - Excess Gibbs energy

KW - Pt-V alloy

KW - Thermodynamics

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