Magnetic structure and Mössbauer spectroscopy of the canted 1D-antiferromagnet Ba2CoFeF9

https://doi.org/10.1016/0038-1098(88)90551-0Get rights and content

Abstract

Ba2CoFeF9 crystallizes with monoclinic space group P21n ,Z Z = 4 with cell parameters at 2.5 K: a = 7.476(6)Å, b = 17.677(2)Å, c = 5.675(4)Åβ = 91.14(9)°. In the structure, infinite cis double [CoFeF9]4− chains of corner sharing octahedra run along the c-axis and are isolated one from each other by barium ions. Antiferromagnetic interactions dominate.

Mössbauer spectroscopy allows to determine the magnetic ordering temperature TN = 42 K and evidences a cationic disorder between Co2+ and Fe3+ (≈0.13). The magnetic structure is established by neutron powder diffraction. The 2.5 K and 2.5–65 K difference patterns are refined by using the Rietveld profile refinement method. The magnetic mode FxCyFz, foreseen by the macroscopic theory of Bertaut, leads to RMag = 0.053, RProfile = 0.105 (difference pattern).

The magnetic moments at dominant sites of Co2+ and Fe3+ are almost antiferromagnetic with a G-type arrangement (μ(Co2+) = 3.52(4) μBμ(Fe3+ = 3.70(4)μB. The moments lie mainly in the (100) plane at ≈ ± 26° from the b-axis.

References (13)

  • G. Ferey et al.

    J. Solid State Chem.

    (1985)
  • M. Vlasse et al.

    J. Solid State Chem.

    (1982)
  • P. Liu et al.

    Solid State Commun.

    (1983)
  • A. de Kozak et al.

    Rev. Chim. Min.

    (1981)
  • A. de Kozak et al.

    Rev. Chim. Min.

    (1982)
  • A. de Kozak et al.
There are more references available in the full text version of this article.

Cited by (0)

View full text