Ternary Phases (Heusler) in the System Ti-Co-Sn
| Autor: | O. B. Karlsen, Andrey Kosinskiy, Magnus Helgerud Sørby, Øystein Prytz |
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| Rok vydání: | 2016 |
| Předmět: |
Neutron powder diffraction
Materials science Solid solubility General Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process 0104 chemical sciences Crystallography Metallic materials Homogeneity (physics) Solubility 0210 nano-technology Ternary operation Material properties |
| Zdroj: | Metallurgical and Materials Transactions E |
| ISSN: | 2196-2944 2196-2936 |
| DOI: | 10.1007/s40553-016-0098-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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