التفاصيل البيبلوغرافية
| العنوان: |
Effects of Oxygen Partial Pressure and Tolerance Factor on Phase Selection of DyMnO3. |
| المؤلفون: |
Kenta Shimomura, Kazuhiko Kuribayashi, Yusaku Seimiya, Suguru Shiratori, Shumpei Ozawa |
| المصدر: |
Materials Transactions; 2023, Vol. 64 Issue 12, p2821-2825, 5p |
| مصطلحات موضوعية: |
PARTIAL pressure, OXYGEN, CRYSTAL structure, MANGANESE, RARE earth metals, SOLIDIFICATION |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
