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Thermophysical Properties of L10 FeNi

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The Fe–Ni alloys excite the curiosity of researchers due to their uniquely low thermal expansion coefficient for Fe-rich compositions and numerous technological and practical applications. In the present paper, we report various finite temperature/pressure thermophysical properties of L10 (CuAu) structured FeNi using plane wave pseudopotential density functional theory as implemented in Quantum ESPRESSO code in conjunction with quasi harmonic Debye model. Calculated equilibrium lattice constant and c/a ratio for L10 (CuAu) phase of FeNi are in good agreement with the available results. Conclusions based on the various finite temperature/pressure thermophysical properties such as the isothermal bulk modulus, room temperature thermal equation of state, coefficient of thermal expansion, heat capacity at constant volume and pressure, Debye temperature and Gr√ľneisen parameter are outlined.
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Keywords: Invar; L10 FeNi; Tetrataenite; Thermophysical Properties

Document Type: Research Article

Affiliations: Department of Physics, University School of Sciences, Gujarat University, Ahmedabad 380009, Gujarat, India

Publication date: November 1, 2016

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