Ternary system Tm-Cu-Ge: isothermal section of the phase diagram at 870 K and crystal structures of the compounds
In: Proceedings of the VIII International Conference on Crystal Chemistry of Intermetallic CompoundsJournal of alloys and compounds 367:70-75; Jg. 367 (2004) S. 70-75
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The isothermal section of the Tm-Cu-Ge phase diagram at 870 K was constructed using X-ray phase analysis. The existence of three ternary compounds was confirmed: TmCu2Ge2 (structure type CeAl2Ga2, space group I4/mmm, Pearson code tI10, a = 3.99155(8)Å, c = 10.3285(2)Å), Tm2CuGe6 (structure type Ce2CuGe6, space group Amm2, Pearson code oS18, a = 4.061(1)Å, b = 3.957(4) Å, c = 20.76(2) Å) and Tm6Cu8Ge8 (structure type Gd6Cu8Ge8, space group Immm, Pearson code oI22, a = 13.7407(3) Å, b = 6.5995(1) Å, c = 4.1368(1) Å). A new ternary copper germanide TmCu1.24Ge0.76 (structure type CaIn2, space group P63/mmc, Pearson code hP6, a = 4.42254(8) Å, c = 7.0477(2) Å) was found. The crystal structures of TmCu2Ge2, Tm6Cu8Ge8 and TmCu1.24Ge0.76 were refined by full-profile Rietveld method using X-ray powder diffraction data. The binary compound Tm0.9Ge2 (structure type ZrSi2) dissolves up to 5 at.% of Cu. The lattice parameters refined for the sample Tm31Cu5Ge64 (a = 4.042(1) Å, b = 15.793(4) Å. c = 3.906(2) Å) slightly increased, compared with Tm0.9Ge2. The solubility of the third component in the other binary phases was found to be negligible.
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Ternary system Tm-Cu-Ge: isothermal section of the phase diagram at 870 K and crystal structures of the compounds
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Autor/in / Beteiligte Person: | FEDYNA, L. O ; BODAK, O. I ; TOKAYCHUK, Ya. O ; FEDYNA, M. F ; MOKRA, I. R |
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Quelle: | Proceedings of the VIII International Conference on Crystal Chemistry of Intermetallic CompoundsJournal of alloys and compounds 367:70-75; Jg. 367 (2004) S. 70-75 |
Veröffentlichung: | Lausanne: Elsevier, 2004 |
Medientyp: | Konferenz |
Umfang: | print, 29 ref |
ISSN: | 0925-8388 (print) |
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