Kimball, Clyde W.
M.S. (Master of Science)
Department of Physics
Iron compounds; Mössbauer spectroscopy; Superconductors
Mössbauer effect measurements were made at ⁵⁷Fe nuclei in FeₓSnMo₆S₈ (x = 0.05, 0.2, 0.4) to study the structural and vibrational properties of nonstoichiometric Chevrel phases in these compounds. The composition dependence at 300K indicates that the Fe atoms occupy similar sites independent of composition. An asymmetric doublet is observed which is interpreted in terms of Fe occupying two nonequivalent sites in the unit cell. The isomer shift between the sites indicates that the valence structure of the Fe atoms in the two sites differs by approximately one 3d-electron. A temperature scan from 4.4K to 300K was done on Fe.₀₅SnMo₆S₈. The temperature dependence of Fe atoms in Fe.₀₅SnMo₆S₈ was analyzed in terms of a Debye model for each site. Results for the shift yield Θ[sub D][^δ](A) = 559K and Θ[sub D][^δ](B) = 205K. Data for the recoil-free fraction produces values of Θ[sub D][^f](A) = 255K and Θ[sub D][^f](B) = 234K.
Dugan, James, "A spectroscopic analysis of the pseudoternary compound Sn₁.₀Fe.₀₅Mo₆S₈" (1980). Graduate Research Theses & Dissertations. 562.
Northern Illinois University
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