Dependence of the deformation of Mn/sub 1-delta/O on the deviation from stoichiometry

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5558204

Routbort, J L

The stress-strain behavior of <100> single crystals of Mn/sub 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%. 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. 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.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5558204
• Report Number(s): CONF-831174-24; ON: DE84003568
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
&amp; Refractories-- Mechanical Properties
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
ENERGY
FREE ENTHALPY
MANGANESE COMPOUNDS
MANGANESE OXIDES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN POTENTIAL
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE