• Title/Summary/Keyword: 자기 구조

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Crystallographic and Magnetic Properties of Li0.5Fe2.5-χRhχO4 by Using Applied Field Mossbauer Spectrometer (외부자기장 뫼스바우어 분광기를 이용한 Li0.5Fe2.5-χRhχO4의 자기적 성질과 결정학적 구조에 관한 연구)

  • Kang, Kun-Uk;Kim, Chul-Sung
    • Journal of the Korean Magnetics Society
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    • v.14 no.6
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    • pp.219-223
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    • 2004

  • L $i_{0.5}$F $e_{2.5-{\chi}}$R $h_{\chi}$ $O_4$ ($\chi$ = 0.25, 0.50, 0.75, 1.00) has been prepared by solid state reaction. Crystallographic and magnetic properties were investigated by Mossbauer spectroscopy, SQUID magnetometry, and x-ray diffraction. The crystal structure is found to be a cubic spinel structure with space group Fd3m for all the samples. The lattice constant $a_{0}$ increases from 8.3365 $\AA$ to 8.3932 $\AA$ with increasing Rh concentration $\chi$. The migration of Li ion has been confirmed by x-ray patterns and the results of applied field Mossbauer analysis. The temperature dependence of the absorption area of each site was analyzed with the Debye model for the recoil-free fraction. The Debye temperature for the octahedral sites is almost as large as for the tetrahedral sites, thereby suggesting similar inter-atomic binding forces for the octahedral and the tetrahedral sites. The saturated magnetic moment and the Mossbauer spectra taken at 4.2 K under the applied field (6 T) show that the spin structure of L $i_{0.5}$F $e_{2.5-{\chi}}$R $h_{\chi}$ $O_4$ is compatible with the collinear Neel Model.

  • https://doi.org/10.4283/JKMS.2004.14.6.219 인용 PDF KSCI