Journal of the Korean Physical Society

  • 제73권11호
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  • Pages.1679-1683
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  • 2018
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  • 0374-4884(pISSN)
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  • 1976-8524(eISSN)
한국물리학회 (Korean Physical Society)
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Magnetic Properties and Hyperfine Interaction of BaSrCo2(Fe1-xAlx)12O22 Hexaferrite

  • Lim, Jung Tae (Powder and Ceramic Division, Korea Institute of Materials Science) ;
  • Kim, Chul Sung (Department of Physics, Kookmin University)
  • 투고 : 2018.10.18
  • 발행 : 2018.11.30
⟨ 이전 논문 다음 논문 ⟩

초록

Polycrystalline $BaSrCo_2(Fe_{1-x}Al_x)_{12}O_{22}$ (x = 0.00, 0.01, 0.05, and 0.10) samples were synthesized by polymerizable complex method. Based on the Rietveld refinement, crystal structures of the samples were found to be single-phased and determined to be rhombohedral with space group of R-3m. The hysteresis curves of the samples were measured under 15 kOe at various temperatures ranging from 4.2 and 295 K. It shows that they were not saturated with increasing Al ion contents due to the reduction of magnetic anisotropy. $M_{15kOe}$ was decreased with increasing Al ions contents. We expect that non-magnetic Al ions preferentially occupy the up-spin site of $18h_{VI}$, $3b_{VI}$, and $3a_{VI}$. The $M{\ddot{o}}ssbauer$ spectra of the samples were obtained at 295 K, and analyzed with sixsextets for Fe sites corresponding to the Y-type hexaferrite crystallography sites. The <$E_Q$> shows abrupt changes, and the <$H_{hf}$> shows abrupt decreases around x = 0.05 due to the coexistence of magnetic secondary phases.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

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피인용 문헌

  1. Magnetic properties of polycrystalline Y-type hexaferrite Ba2-xSrxNi2(Fe1-yAly)12O22 using Mössbauer spectroscopy vol.10, pp.1, 2020, https://doi.org/10.1063/1.5130045