Title

Neutron Diffraction and Mössbauer-effect Study of (MnₓFe₁₋ₓ)yO Solid Solutions

Abstract

The nonstoichiometric solid solutions (MnxFe1-x)yO have been studied at low temperatures by Mössbauer spectroscopy and Rietveld analysis of powder neutron diffraction data. For x < 0.23, the neutron measurements show that the spin direction is between the [111] axis and the (111) plane, as in FeyO itself, but for x > 0.23 the spins appear to lie in the (111) plane. Except for samples with y close to unity, the coherent magnetic scattering is less than expected, indicating that long-range magnetic ordering is not complete. The Mössbauer spectra of samples containing large concentrations of iron(III) are very complex and are fitted to a model with three hyperfine sextets, two for octahedral iron(II) and one for octahedral iron(III), and a quadrupole doublet for tetrahedral iron(III). For samples containing almost no iron(III), the spectra were fitted to a model with three iron(II) sextets, corresponding to sites with differing numbers of manganese neighbors. 1984 American Chemical Society.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1984 American Chemical Society (ACS), All rights reserved.


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