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Experimental investigation on the enthalpies of formation of the DyFe2, DyFe3, Dy2Fe17, ErFe2, and ErFe3 intermetallic compounds

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Abstract

The enthalpies of formation at 298.15 K for five intermetallic phases in the Fe-Dy and Fe-Er binary systems have been determined by indirect solution calorimetry in liquid aluminum at 1100 K. The phases were Fe2Dy, Fe3Dy, and Fe17Dy2 in the Fe-Dy system and Fe2Er and Fe3Er in the Fe-Er system. The following mean values of Δ f H 298.15 K are reported: −11.1 kJ/mole for Fe2/3Dy1/3, −7.7 kJ/mole for Fe3/4Dy1/4, −1.9 kJ/mole for Fe17/19Dy2/19, −12.5 kJ/mole for Fe2/3Er1/3, and −7.9 kJ/mole for Fe3/4Er1/4. The measured enthalpies of formation of the Fe2Dy and Fe2Er compounds are almost equal, as are the enthalpies of formation of the Fe3Dy and Fe3Er compounds. The results are compared with earlier experimental data, with values predicted by Miedema’s semiempirical method and with calculated results obtained by Colinet and Pasturel using a tight binding model.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Royal Institute of Technology, S-100 44, Stockholm, Sweden

    S. Norgren (Graduate Student)

  2. LTPCM/INPG, 38402, Saint Martin d’Heres, France

    F. Hodaj (Professor) & C. Colinet (Professor)

  3. I.U.T. 1 UJF, 38000, Grenoble, France

    P. Azay

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  1. S. Norgren
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  2. F. Hodaj
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  3. C. Colinet
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  4. P. Azay
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Norgren, S., Hodaj, F., Colinet, C. et al. Experimental investigation on the enthalpies of formation of the DyFe2, DyFe3, Dy2Fe17, ErFe2, and ErFe3 intermetallic compounds. Metall Mater Trans A 29, 1367–1374 (1998). https://doi.org/10.1007/s11661-998-0351-3

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  • DOI: https://doi.org/10.1007/s11661-998-0351-3

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