Crystallographic and Magnetic Properties of the Ferrimagnetic $Fe_7Se_8$ by M$\ddot{o}$ssbauer Spectroscopy

뫼스바우어 분광법에 의한 준강자성체 $Fe_7Se_8$의 결정학적 특성 및 자기적 특성

  • 조용호 (영남대학교 전기전자공학부) ;
  • 김효준 (영남대학교 전기전자공학부) ;
  • 이동욱 (영남대학교 전기전자공학부) ;
  • 김응찬 (영남대학교 물리학과) ;
  • 남효덕 (영남대학교 전기전자공학부)
  • Published : 1998.01.01

Abstract

M$\ddot{o}$ssbauer spectra of ferrimagnetic $Fe_2SE_8$ prepared with $^{57}Fe$ enriched iron have been taken at 298 K and below 78K, and Fe\ulcornerSe\ulcorner has been studied by X-ray diffraction. The crystal structure is found to be a "3c" hexagonal superstructure of the NiAs structure. Three sets of six-line hyperfine patterns were obtained and assigned to three magnetically nonequivalent sites of a superstructure of the crystal. The iron ions at all three sites are found to be in a highly covalent ferrous state. It is shown that the results obtained at the low temperature region are well consistent with Okazaki's "3c" superstructure model.uperstructure model.

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