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The niobium (columbium)-platinum constitution diagram

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Abstract

The Nb-Pt system was investigated over the entire composition range by metallography and X-ray diffraction analysis. The solubility limits of terminal and intermediate phases and solidus temperatures were determined. α-Nb dissolves ≈12 at. pct Pt at 2040 °C and ≈5 at. pct Pt at 1150 °C; α-Pt dissolves ≈20 at. pct Nb at 2000 °C and ≈ 18 at. pct Nb at temperatures below 1700 °C. The presence of six intermediate phases, Nb3Pt (Cr3O, A15 or β-W type), σ(≈Nb2Pt, β-U type), Nb1−xPt1+x (AuCd type), α′-Pt (undetermined structure), NbPt2 (MoPt2 type), α-NbPt3 (TiCu3 type), and β-NbPt3 (β-NbPt3 type) was confirmed. The phase NbPt3 melts congruently at ≈2040 °C, and σ forms peritectically at ≈1800 °C. By analogy with related systems, the high-temperature phase α′-Pt is probably an extension of and isomorphous with α-Pt solid solution. Eight three-phase reactions are described, the mean atomic volumes are given, and crystal chemical relationships among the six homologous T5-T10 systems (T5 = V, Nb, Ta; T6 = Pd, Pt) are discussed.

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Authors and Affiliations

  1. American Dental Association Health Foundation, Paffenbarger Research Center, National Bureau of Standards, 20899, Gaithersburg, MD

    R. M. Waterstrat

  2. Materials Science Division, Barnett Institute, 02115, Boston, MA

    B. C. Giessen

  3. Department of Chemistry, Northeastern University, 02115, Boston, MA

    B. C. Giessen

Authors
  1. R. M. Waterstrat
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  2. B. C. Giessen
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Waterstrat, R.M., Giessen, B.C. The niobium (columbium)-platinum constitution diagram. Metall Trans A 16, 1943–1949 (1985). https://doi.org/10.1007/BF02662395

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