Doctoral Dissertations


"In this thesis the Mössbauer spectra of Ce2Fe17Hx, where x is 0, 1,2, 3, 4, and 5, Pr2Fe17Hx where x is 0, 1, 2, 3, 4, and 5, Dy2Fe17Hx where x is 0, 1,2, 3, and 3.8, Tb2Fe17-xSix, where x is 0, 1, 2, and 3, and Nd6Fe13X, where X is Au, Ag, Cu, and Si, have been measured between 450 to 4.2 K.

Ce2Fe17 crystallizes in the R-3m space group and exhibits a helical magnetization from 225 to 90 K and a fan magnetization below 90 K. The helical magnetization was modeled in the Mössbauer spectra by a distribution of θ angles and hyperfine fields. The hyperfine parameters were found to have the expected temperature dependence and to be in good agreement with the hyperfine parameters found for the hydrides. Pr2Fe17H5 is the first R2Fe17Hx compound to show an unusual change in the Mössbauer spectra below 155 K, a change which was attributed to the freezing of the motion of the 18g hydrogen from site to site on the Mössbauer time scale. Dy2Fe17Hx crystallizes in the hexagonal P63/mcm space group and exhibits a disorder of the 4e, 4f iron and 2c, 2d dysprosium site, a disorder which was modeled in the observed Mössbauer spectra.

Tb2Fe17-xSix shows an unexpected improvement in the magnetic properties with increasing silicon content in spite of a contration of the unit cell upon the substitution of iron by silicon.

Nd6Fe13Ar crystallizes in the I4|mmc space group and exhibits a basal magnetization for X = Ag, Au, and Cu. Nd6Fe13Si shows a spin reorientation from axial at 155 K towards basal at 80 K"--Abstract, page v.


Long, Gary J., 1941-

Committee Member(s)

Pringle, Oran Allan
Sinn, Ekkehard
Biolsi, Louis, Jr.
Grandjean, Fernande, 1947-
Isnard, Olivier



Degree Name

Ph. D. in Chemistry


The author thanks the Materials Research Division of the U. S. National Science Foundation for financial support through grant DMR-9521739.


University of Missouri--Rolla

Publication Date

Summer 2000

Journal article titles appearing in thesis/dissertation

  • A Mössbauer Spectral Study of the Magnetic Properties of Ce2Fe17 and its Hydrides
  • Hydrogen Dynamics in the Hydrides of Pr2Fe17 as Revealed by Mössbauer Spectroscopy
  • A Structural, Magnetic, and Mössbauer Spectral Study of Dy2Fe17 and its Hydrides
  • A Mössbauer Spectral Study of Tb2Fe17 and the Tb2Fe17-xSix, Solid Solutions
  • Mössbauer Spectral Study of Nd6Fe13X, where X is Cu, Ag, and Au, and the Spin-reorientation in Nd6Fe13Si
  • A Mössbauer Spectral Study of the Nd6Fe,,X Compounds, where X is Si, Cu, Ag, and Au
  • Magnetic and Mössbauer Spectral Properties of the Compound Nd6Fe13Au


xviii, 235 pages

Note about bibliography

Includes bibliographical references.


© 2000 Dimitri Stanislas Hautot, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type




Thesis Number

T 7784

Print OCLC #


Link to Catalog Record

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