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 ; Study on Factors Hindering the Single-phase Formation of Divalent-ion-stabilized W-type Ferrites
粉体粉末冶金協会 ; Japan Society of Powder and Powder Metallurgy, 2022
Online
academicJournal
Zugriff:
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⁺.
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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 ; Study on Factors Hindering the Single-phase Formation of Divalent-ion-stabilized W-type Ferrites
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Autor/in / Beteiligte Person: | 中井, 慎司 ; 和氣, 剛 ; 田畑, 吉計 ; 加藤, 将樹 ; 太田, 寛人 ; 中村, 裕之 ; NAKAI, Shinji ; WAKI, Takeshi ; TABATA, Yoshikazu ; KATO, Masaki ; OHTA, Hiroto ; NAKAMURA, Hiroyuki |
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Veröffentlichung: | 粉体粉末冶金協会 ; Japan Society of Powder and Powder Metallurgy, 2022 |
Medientyp: | academicJournal |
ISSN: | 0532-8799 (print) ; 1880-9014 (print) |
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