Study on Factors Hindering the Single-phase Formation of Divalent-ion-stabilized W-type Ferrites
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- NAKAI Shinji
- Department of Materials Science and Engineering, Kyoto University
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- WAKI Takeshi
- Department of Materials Science and Engineering, Kyoto University
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- TABATA Yoshikazu
- Department of Materials Science and Engineering, Kyoto University
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- KATO Masaki
- Department of Molecular Chemistry and Biochemistry, Doshisha University
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- OHTA Hiroto
- Department of Molecular Chemistry and Biochemistry, Doshisha University
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- NAKAMURA Hiroyuki
- Department of Materials Science and Engineering, Kyoto University
Bibliographic Information
- Other Title
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- 2価イオン安定化W型Srフェライトの単相化阻害要因の検討
- 2カ イオン アンテイカ Wガタ Sr フェライト ノ タンソウカ ソガイ ヨウイン ノ ケントウ
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Abstract
<p>Me-substituted W-type ferrites (AMe2Fe16O27 with A = Sr, Ba, …, and Me = Co, Ni, Zn, Mg, …) can be obtained by standard solid state reaction but always contain secondary phases. Phase stability of SrMe2Fe16O27 with Me = Co, Ni, Zn, and Mg sintered in various oxygen pressures of pO2 = 0.2, 1, 10 and 387 atm were investigated using X-ray diffraction analysis, wavelength-dispersive X-ray (WDX) analysis, and transmission electron microscopy (TEM). WDX analysis revealed that the W-type ferrites are described as SrMe2-δFe16+δO27 because Fe3+ is partially reduced to Fe2+ even when synthesis is initiated from SrMe2Fe16O27. Increasing the oxygen pressure suppresses the reduction of Fe3+ and the formation of the secondary phases. In addition, TEM analysis shows that the SrCo2Fe16O27 single crystal is free of stacking faults. We conclude that the single-phase formation of the Me-substituted W-type ferrites is hampered by the discrepancy between initial and actual chemical composition caused by the appearance of Fe2+.</p>
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 69 (11), 455-460, 2022-11-15
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390012638729711616
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- HANDLE
- 2433/283241
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- NDL BIB ID
- 032524495
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
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- Abstract License Flag
- Disallowed