Dependence of the deformation of Mn/sub 1-delta/O on the deviation from stoichiometry
Journal Article
·
· Mater. Res. Soc. Symp. Proc.; (United States)
OSTI ID:5541370
The stress-strain behavior of <100> single crystals of Mn/sup 1-delta/O has been measured for the first time. The experiments were performed at 1200/sup 0/C varying the oxygen partial pressure p/sub O/sub 2/ from 10/sup -12/ to 10/sup -5/ atms which causes the deviation from stoichiometry delta to vary between 5 x 10/sup -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 delta and exhibit a maximum at p/sub O/sub 2/ approx. 10/sup -9/ atms. The present results suggest that the diffusion of oxygen interstitials control deformation for large delta while oxygen vacancies control deformation for small delta, an interpretation used to explain the deformation Co/sub 1-delta/O. These results illustrate the intimate relationship between defect properties and deformation in nonstoichiometric oxides. 16 references, 4 figures, 2 tables.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 5541370
- Journal Information:
- Mater. Res. Soc. Symp. Proc.; (United States), Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Vol. 24; ISSN MRSPD
- Country of Publication:
- United States
- Language:
- English
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