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Ternary Phases (Heusler) in the System Ti-Co-Sn

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Metallurgical and Materials Transactions E

Abstract

Some of the Heusler-phases (XY 2 Z and XYZ) are known to have large homogeneity ranges which can be useful for tuning material properties. In this work, we have revised the isothermal section of the Ti-Co-Sn system at 973 K (700 °C). A total of 29 ternary compositions, mostly in the regions TiCo2−x Sn for 0 ≤ x ≤ 1 and Ti1+y Co2Sn1−y for 0 ≤ y ≤ 1, were prepared by arc-melting, then ball-milled and annealed. The resulting annealed powder samples were studied by applying the Rietveld method to X-ray and neutron powder diffraction data. Half-Heusler TiCoSn was not observed. The Heusler phase observed in TiCo2−x Sn has compositions ranging from TiCo1.52Sn to TiCo2Sn and has the half-Heusler structure where the excess of Co is located on the semi-filled tetrahedral site 4d (¾, ¾, ¾) in the space group F-43m. At 1273 K (1000 °C), this solid solubility is expanded from TiCo2Sn to TiCo with full solid solubility where Ti is gradually replacing Sn (Ti1+y Co2Sn1−y for 0 ≤ y ≤ 1), while at 973 K (700 °C) there is a small solubility gap for 0.0 ≤ y ≤ 0.2.

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Acknowledgments

This research was partially supported by the research project THELMA (Project No. 228854) funded by The Research Council of Norway. David Wragg is acknowledged for guidance with the diffraction experiments. The authors furthermore want to thank the Basic and Applied ThermoElectric intiative (BATE) and especially Professor Emeritus Johan Taftø for initiation, inspiration and guidance into the realm of thermoelectricity.

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Authors and Affiliations

  1. Department of Physics, University of Oslo, Blindern, P.O. Box 1048, Oslo, Norway

    Andrey Kosinskiy (Engineer), Ole Bjørn Karlsen (Senior Engineer) & Øystein Prytz (Associate Professor)

  2. Physics Department, Institute for Energy Technology, P.O. Box 40, Kjeller, Norway

    Magnus H. Sørby (Senior Scientist)

Authors
  1. Andrey Kosinskiy
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  2. Ole Bjørn Karlsen
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  3. Magnus H. Sørby
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  4. Øystein Prytz
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Correspondence to Øystein Prytz.

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Manuscript submitted May 5, 2016.

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Kosinskiy, A., Karlsen, O.B., Sørby, M.H. et al. Ternary Phases (Heusler) in the System Ti-Co-Sn. Metallurgical and Materials Transactions E 3, 329–336 (2016). https://doi.org/10.1007/s40553-016-0098-5

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  • DOI: https://doi.org/10.1007/s40553-016-0098-5

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