Effects of Oxygen Partial Pressure and Tolerance Factor on Phase Selection of DyMnO₃

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  • Shimomura Kenta
    Department of Advanced Materials Science and Engineering, Chiba Institute of Technology
  • Kuribayashi Kazuhiko
    Research Liaison Centre, Chiba Institute of Technology Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
  • Seimiya Yusaku
    Department of Advanced Materials Science and Engineering, Chiba Institute of Technology
  • Shiratori Suguru
    Department of Mechanical Systems Engineering, Tokyo City University
  • Ozawa Shumpei
    Department of Advanced Materials Science and Engineering, Chiba Institute of Technology

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  • Effects of Oxygen Partial Pressure and Tolerance Factor on Phase Selection of DyMnO<sub>3</sub>

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<p>The equilibrium crystal structure of LnMnO3 (Ln: lanthanide) is known to be orthorhombic when larger ions from La3+ to Dy3+ are used as Ln3+, and hexagonal when smaller ions from Ho3+ to Lu3+ are used. Research indicates that the hexagonal phase forms when the tolerance factor, expressed as functions of radii of the constituent ions, is less than 0.840. In this study, we attempted to induce oxygen deficiency in DyMnO3 through solidification at low oxygen partial pressure using an aerodynamic levitator. The objective was to decrease the tolerance factor by reducing the valence of manganese ions and thereby increasing their ionic radius. The results showed an increase in oxygen deficiency as the oxygen partial pressure decreased. Based on the assumption that the manganese ions’ valence decreased due to an increase in oxygen deficiency, the corresponding tolerance factor evaluated from the average ionic radii of manganese and oxygen also decreased. This decrease promoted the formation of the hexagonal phase, similar to the effect observed when the ionic radius of Ln3+ is reduced.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 87 (2023) 226–230. The abstract and figure captions are modified.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (12), 2821-2825, 2023-12-01

    公益社団法人 日本金属学会

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