Search for small-angle neutron scattering in MnO at 1700K
A preliminary small-angle scattering (SANS) experiment has been performed on MnO single crystal at the Intense Pulsed Neutron Source. The experiment was preformed at 1700/sup 0/K at oxygen partial pressures of 2.2 x 10/sup -4/, 1 x 10/sup 2/, and 2 x 10/sup 2/ Pa, which resulted in deviations from stoichiometry of about 0.0015, 0.082, and 0.127. No statistically significant change in SANS was observed at this temperature with the pressure changes. Neither was any significant change observed in the wavelength-dependent sample transmission, also measured in-situ as a function of pressure. Therefore, either clustering of cation vacancies is negligible in MnO for these conditions, or the clusters are smaller than about 5 A. Of proposed cluster configurations, only the existence of the smallest (4:1, 6:2, or possible 8:3) appears to be consistent with these results.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6815430
- Report Number(s):
- CONF-8608139-2; ON: DE87001527
- Resource Relation:
- Conference: Conference on non-stoichiometric compounds: the chemistry, physics and technological uses of non-stoichiometric compounds, Keele, UK, 31 Aug 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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MANGANESE OXIDES
VACANCIES
CATIONS
CHEMICAL COMPOSITION
MONOCRYSTALS
NEUTRON DIFFRACTION
OXYGEN
PARTIAL PRESSURE
SMALL ANGLE SCATTERING
VARIATIONS
VERY HIGH TEMPERATURE
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELEMENTS
IONS
MANGANESE COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
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Cermets
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