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<p>Phase equilibria in the L<i>n</i><sub>2</sub>O<sub>3</sub>–Nb<sub>2</sub>O<sub>5</sub> (L<i>n</i> = La, Nd) binary systems and liquidus temperatures were experimentally established in air atmosphere up to 1800&#xa0;°C using DSC/TGA analysis combined with a high-temperature equilibration and quenching method. The phase composition and microstructure of the equilibrated samples were characterized by powder X-ray diffraction and scanning electron microscopy, and melting points were confirmed through pyrometric observations. The binary compounds <i>Ln</i><sub>3</sub>NbO<sub>7</sub>, <i>Ln</i>NbO<sub>4</sub>, LnNb<sub>3</sub>O<sub>9</sub> (<i>Ln</i> = La, Nd), and LaNb<sub>5</sub>O<sub>14</sub> were identified. Their crystal structures were refined using Rietveld analysis. The composition and melting point of eutectic/peritectic mixtures in both systems were also determined.</p>

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Phase diagram study of the Ln2O3–Nb2O5 (Ln = La, Nd) systems

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • B. Pilarek,
  • A. Pelczarska,
  • I. Szczygieł

摘要

Phase equilibria in the Ln2O3–Nb2O5 (Ln = La, Nd) binary systems and liquidus temperatures were experimentally established in air atmosphere up to 1800 °C using DSC/TGA analysis combined with a high-temperature equilibration and quenching method. The phase composition and microstructure of the equilibrated samples were characterized by powder X-ray diffraction and scanning electron microscopy, and melting points were confirmed through pyrometric observations. The binary compounds Ln3NbO7, LnNbO4, LnNb3O9 (Ln = La, Nd), and LaNb5O14 were identified. Their crystal structures were refined using Rietveld analysis. The composition and melting point of eutectic/peritectic mixtures in both systems were also determined.