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In this study, the solubilities of oxygen in molten Sm -La-O alloys were measured and the oxide phases in quilibrium with the alloys were identified at temperatures between 1473 –1673 K. Sm2O3 oxide pellets and Sm-La-O alloy were annealed at a fixed temperature, at which the alloy phase was maintained as liquid. Then the samples were quenched by dropping into cooling water. The oxygen concentration in the quenched alloy phase was measured using inert gas fusion infrared absorption spectroscopy. The oxygen solubility increased with the increase in temperature and the composition of Sm. The composition and crysta l structure of the oxide region of the quenched samples were analyzed using SEM-EDS and XRD, resulting in A or B type (La, Sm) 2O3 stably existed at high temperatures with molten alloy. Larger values in Sm/(Sm+La) ratio was identified in the oxide phase than the Sm-La-O alloy phase.

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• In Copyright
  

Keyword: Phase diagrams, oxydation, calphad, phase equilibria

Date published: 2024-10-01

Publisher: Japan Institute of Metals

Journal:

• Journal of the Japan Institute of Metals and Materials (ISSN: 00214876) vol. 88 issue. 10 p. 245-251 J2023043

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2320/jinstmet.j2023043

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Updated at: 2024-10-02 12:30:13 +0900

Published on MDR: 2024-10-02 12:30:14 +0900