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Title: 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.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
6815430
Report Number(s):
CONF-8608139-2
ON: DE87001527
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
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
Research Org:
Argonne National Lab., IL (USA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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 360202* -- Ceramics, Cermets, & Refractories-- Structure & Phase Studies