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Valency compensation in the Laves system, Ce(Co1−x Ni x )2

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Abstract

The pseudo-binary systems Ce (Co1−x Ni x )2 (and for comparison, Zr(Co1−x Ni x )2), 0⩽x⩽1.0 have been studied by means of magnetic susceptibility measurements and by room-temperature X-ray diffraction. The experimental data indicate that the electronic state of cerium in the Ce(Co1−x Ni x )2 alloys is variable as a function of composition, and the behaviour is interpreted on the basis of a comparison with the similar system Zr(Co1−x Ni x )2 in which zirconium is regarded as a stable tetravalent element. A limit in the stability of the Laves phase in the Zr(Co1−x Ni x )2 system has been found at x−0.76 (∼ 51at% Ni); this behaviour is interpreted in terms of the electron concentration reaching a maximum value for the stability of the cubic Laves phase structure in these alloys. The Laves phases in the Ce(Co1−x Ni x )2 alloy system form a complete solid solution; this behaviour is interpreted in terms of the stability of the structure being maintained across the whole composition range by changes in the effective valency of the cerium atoms as the cobalt atoms are substituted by nickel, i.e. a “valency compensation” effect. From a comparison with the lattice parameter of the Zr(Co1−x Ni x )2 alloys it was possible to determine an approximate value of 3.4 for the effective valency of cerium in the CeNi2 phase.

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Author notes

  1. J. M. Da C. Brochado Oliveira

    Present address: Laboratorio de Fisica and Centro de Fisica (INIC), Faculdade de Ciencias, Universidade do Porto, 4000, Porto, Portugal

Authors and Affiliations

  1. Department of Metallurgy and Materials, University of Birmingham, Birmingham, UK

    J. M. Da C. Brochado Oliveira & I. R. Harris

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  1. J. M. Da C. Brochado Oliveira
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  2. I. R. Harris
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Oliveira, J.M.D.C.B., Harris, I.R. Valency compensation in the Laves system, Ce(Co1−x Ni x )2 . J Mater Sci 18, 3649–3660 (1983). https://doi.org/10.1007/BF00540737

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  • DOI: https://doi.org/10.1007/BF00540737

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