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The Dependence of the Deformation of Mn1-δO; on the Deviation from Stoichiometry**

Published online by Cambridge University Press:  21 February 2011

J. L. Routbort
J. L. Routbort*
Affiliation:
Materials Science and Technology Division Argonne National Laboratory, Argonne, IL 60439
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Abstract

The stress-strain behavior of <100> single crystals of Mn1-δQ has been measured for the first time. The experiments were performed at 1200°C varying the oxygen partial pressure PO2 from 10-12 to 10-5 atms which causes the deviation from stoichiometry δ to vary between 5×10-2 to 2 percent. The upper yield stress and the stress achieved at a zero work-hardening rate vary by a factor of 2 as a function of δ and exhibit a maximum at pO2∼10-9 atms. The present results suggest that the diffusion of oxygen interstitials control deformation for large δ while oxygen vacancies control deformation for small δ, an interpretation used to explain the deformation Co1-δQ. These results illustrate the intimate relationship between defect properties and deformation in nonstoichiometric oxides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 24: Symposium B – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1983 , 93
Copyright
Copyright © Materials Research Society 1984

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Footnotes

*

Work supported by the U.S. Department of Energy.

References

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