Kimball, Clyde W.
M.S. (Master of Science)
Department of Physics
Iron compounds; Mössbauer spectroscopy; Superconductors
A Mössbauer study has been designed to use ⁵⁷Fe as an impurity probe in the superconducting compound Ho₁.₀Mo₆S₈ over the temperature range 4.3 K to 673 K. Although it has been determined by neutron diffraction that Fe occupies only one crystallographic site, the Mössbauer spectra obtained show two different electronic configurations for the ⁵⁷Fe impurity. At temperatures less than 30 K the spectra show a relaxing single line along with a quadrupole doublet which starts relaxing below 10 K. Above 50 K there appears to be diffusion of Fe atoms between the two sites. The intensity, shift, quadrupolar splitting and width were monitored in an effort to explain these anomalies m the behavior of ⁵⁷Fe in this Chevrel phase superconductor.
Karlov, Thomas F., "Mössbauer study of the Chevrel phase compound Ho₁.₀Fe.₀₅Mo₆S₈" (1980). Graduate Research Theses & Dissertations. 4015.
iv, 31 pages
Northern Illinois University
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