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- Title
Compression, nonstoichiometry and bulk viscosity of wüstite.
- Authors
Jeanloz, Raymond; Hazen, Robert M.
- Abstract
Wüstite (Fe1-xO) is a complex oxide that is invariably non-stoichiometric (0.04 \[gsims] x \[gsims] 0.12). Point defects associated with this nonstoichiometry are clustered and result in a modulated crystal structure that has been extensively studied, but is not well understood1-4. Many of the properties of these compounds, such as chemical diffusivity, electrical conductivity and magnetic transitions, seem to be significantly affected by the nonstoichiometry and resulting ordering of defects5-8. We summarize here new and existing data on the elasticity of wüstite; these data indicate virtually no correlation between the bulk modulus and stoichiometry. There appears, however, to be a systematic difference between static and dynamic measurements. This behaviour suggests the presence of a frequency dependence to the bulk modulus that can be ascribed formally to a finite bulk viscosity of Fe1-xO. Such an effect has not previously been described in oxide or silicate minerals, and it is presumably caused by pressure-induced changes in defect ordering and subsequent relaxation within the incommensurate structure of wüstite.
- Publication
Nature, 1983, Vol 304, Issue 5927, p620
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/304620a0