Preparation of Sr-based hexagonal ferrite by controlling the oxidation state of Fe

• Meguro M.

  Graduate School of Science and Engineering, Saitama University

• Kakizaki K.

  Graduate School of Science and Engineering, Saitama University

• Kamishima K.

  Graduate School of Science and Engineering, Saitama University

Abstract

We have investigated synthesis conditions and magnetic properties of Sr₂Fe²⁺₂Fe³⁺₁₂O₂₂ (Sr₂Fe₂Y). The main Y-type phase was observed for the sample synthesized with the initial composition of Sr:Fe²⁺:Fe³⁺=1.5:2:8 sintered at T_S=1200℃ and P_O2=10 Pa. The Curie temperature of Sr₂Fe₂Y was 643 K. The magnetization was 45.0 Am²/kg at T= 5 K and μ₀H=7 T. The difference in magnetization from the ideal collinear spin arrangement of Sr₂Fe₂Y is due to the existence of a minor Fe₃O₄-like spinel phase. The yield of Sr₂Fe₂Y phase was estimated to be 83 wt.%, suggesting successful synthesis of the Sr₂Fe₂Y hexaferrite.

Journal

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 43 (3), 183-186, 2018-06-01

  The Materials Research Society of Japan

Keywords

• ferrite
• hexaferrite
• Y-type
• Fe²⁺

Details

• CRID: 1390564237990476672
• NII Article ID: 130007382955
• DOI: 10.14723/tmrsj.43.183
• ISSN: 21881650
• ISSN: 13823469
• Web Site: https://www.jstage.jst.go.jp/article/tmrsj/43/3/43_183/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed