James Dugan

Publication Date

1980

Document Type

Dissertation/Thesis

First Advisor

Kimball, Clyde W.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics

LCSH

Iron compounds; Mössbauer spectroscopy; Superconductors

Abstract

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.

Comments

Includes bibliographical references.

Extent

48 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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