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<p>The phase equilibria of the ternary La-Ni–Sn system have been experimentally studied at temperatures of 300 and 600 °C using long-term annealed samples. The coexisting phases were characterized by scanning electron microscopy SEM and powder X-ray diffraction XRD. The phase transformation temperatures were analyzed using thermal analysis DTA or DSC methods. The LaNi<sub>5</sub> phase, which is known as a hydrogen storage material, was observed to have up to 10% tin solubility at 600 °C. At a temperature of 300 °C, there is a region of miscibility gap between 1.9 and 6.5 at% Sn which is no longer present at 600 °C. Twelve ternary intermetallic phases were found at 300 °C and eleven ternary intermetallic phases at 600 °C. None of them showed a noticeable homogeneity range. Based on the experimental data obtained, isothermal sections of the La-Ni–Sn phase diagram were constructed at 300 and 600 °C.</p> Graphical Abstract <p></p>

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Experimental Study of the Phase Diagram of the La-Ni–Sn System at 300 and 600  °C

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月17日

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  • Ondrej Zobac,
  • Rudolf Zizka,
  • Klaus W. Richter,
  • Bedrich Smetana,
  • Simona Zla,
  • Monika Kawulokova,
  • Ales Kroupa

摘要

The phase equilibria of the ternary La-Ni–Sn system have been experimentally studied at temperatures of 300 and 600 °C using long-term annealed samples. The coexisting phases were characterized by scanning electron microscopy SEM and powder X-ray diffraction XRD. The phase transformation temperatures were analyzed using thermal analysis DTA or DSC methods. The LaNi5 phase, which is known as a hydrogen storage material, was observed to have up to 10% tin solubility at 600 °C. At a temperature of 300 °C, there is a region of miscibility gap between 1.9 and 6.5 at% Sn which is no longer present at 600 °C. Twelve ternary intermetallic phases were found at 300 °C and eleven ternary intermetallic phases at 600 °C. None of them showed a noticeable homogeneity range. Based on the experimental data obtained, isothermal sections of the La-Ni–Sn phase diagram were constructed at 300 and 600 °C.

Graphical Abstract