Ultra-Fine Spherical Particles of γ-Alumina: Electron Microscopy of Crystal Structure and Surface Morphology at Atomic Resolution
- 1 June 1984
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 23 (6A) , L347
- https://doi.org/10.1143/jjap.23.l347
Abstract
The γ-alumina particles are produced by a dry method developed by the author. Three types of structures, tentatively called δ' (orthorhombic; Pmn21; a=8.2, b=16.4, c=11.8 Å), θ1 (monoclinic; B2/b; a=11.1, b=12.1, c=17.7 Å, β=103° ) and θ2 (monoclinic, B2/m; a=11.1, b=12.1, c=2.9 Å, β=103°) are found. The particle is spherical but facetted with flat {111} and {100} surfaces; {110} surfaces consist of many small {111} facets. As a new approach to ceramics and catalysis research, surface morphology of a neck portion of two coalescing particles, and clusters of Rh6(CO)16 impregnated on the particles are demonstrated for the first time.Keywords
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