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Electron microscopy and krypton adsorption characterization of high-purity MgO powder

Published online by Cambridge University Press:  03 March 2011

M. Bretz ,
A. G. Shastri  and
J. Schwank
M. Bretz
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109
A. G. Shastri
Affiliation:
Department of Chemical Engineering, The University of Michigan, Ann Arbor, Michigan 48109
J. Schwank
Affiliation:
Department of Chemical Engineering, The University of Michigan, Ann Arbor, Michigan 48109
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Abstract

A promising method for the preparation of sizeable quantities of structurally well-defined, highpurity MgO powder is reported. The morphology and surface uniformity of the powder is comparable to that of MgO smokes but with narrow size distribution of particles. Sample characterization of these oxide powders is accomplished by combining structural TEM/STEM examination with krypton gas adsorption isotherms. The latter technique is sensitive to the presence of surface hydroxyl groups and of surface roughness on an atomic scale. Highresolution TEM indicates a perfect cubic morphology, intra-crystallite orientation, and dendritic sintering of cubes. In the STEM mode sharp convergent beam electron diffraction patterns are obtained, and in thick specimen regions Kikuchi lines appear, indicating the absence of crystal defects. After prolonged outgassing to remove surface hydroxyl groups, a krypton adsorption isotherm contains a near vertical submonolayer riser and second layer step along with partial wetting features near saturation. These near-ideal dendritic ceramic powders, therefore, provide a research bridge between single crystal surface studies and large-scale powder technology.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 1 , February 1986 , pp. 114 - 119
Copyright
Copyright © Materials Research Society 1986

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References

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