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Magnetic dilution effect on the charge transfer phase transition and the ferromagnetic transition for an iron mixed-valence complex, (n-C3H7)4N[FeII1−xZnIIxFeIII(dto)3] (dto = C2O2S2)

Authors
Journal
Polyhedron
0277-5387
Publisher
Elsevier
Publication Date
Volume
28
Identifiers
DOI: 10.1016/j.poly.2009.01.021
Keywords
  • Iron Mixed-Valence Complex
  • Ferromagnetism
  • Charge Transfer Phase Transition
Disciplines
  • Physics

Abstract

Abstract Iron mixed-valence complex, ( n-C 3H 7) 4N[Fe IIFe III(dto) 3] (dto = C 2O 2S 2) shows a new-type of phase transition coupled with spin and charge around 120 K, where the charge transfer between the Fe II and Fe III sites occurs reversibly, and shows the ferromagnetic transition at 7 K. To investigate the magnetic structure and its dimensionality of ( n-C 3H 7) 4N[Fe IIFe III(dto) 3], we have synthesized a mixed crystal system, ( n-C 3H 7) 4N[Fe II 1− x Zn II x Fe III(dto) 3], and measured its magnetic properties. In this system, the magnetic moment is reduced with increasing of Zn ratio. Moreover, the ferromagnetic interaction changes to the antiferromagnetic one and the remnant magnetization disappears between x = 0.48 and 0.96, while the charge transfer between the Fe II and Fe III sites disappears above x = 0.26. In this paper, we present the magnetic dilution effect on the charge transfer phase transition and the ferromagnetic transition by means of magnetic susceptibility measurement and 57Fe Mössbauer spectroscopy.

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