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Moessbauer spectroscopic studies of iron-doped rutile.Moessbauer spectra were obtained of single crystal and powdered samples of rutile (TiO2) doped to about one percent by weight in isotopically enriched iron. It is shown that the oxidation state may be reversibly altered in situ. After reduction, the oxygen neighbors of the dopant ion are apparently shifted to accomodate the larger ferrous ion. The agreement of calculated quadrupole splittings with experimental results suggests that impurities and oxygen vacancies are uniformly distributed in powdered samples, giving the dopant ions an 'ideal lattice' local environment. The differences between the single crystal and powder sample hyperfine parameters are attributed to variations in stoichiometry, charge compensation mechanisms, or other diffusion related parameters.
Document ID
19730038765
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stampfl, P. P.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Travis, J. C.
Bielefeld, M. J.
(National Bureau of Standards Washington, D.C., United States)
Date Acquired
August 7, 2013
Publication Date
January 16, 1973
Publication Information
Publication: - Applied Research
Volume: 15
Subject Category
Physics, Solid-State
Accession Number
73A23567
Distribution Limits
Public
Copyright
Other

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