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3345528 
Journal Article 
Ultra-fine spherical particles of γ-alumina: Electron microscopy of crystal structure and surface morphology at atomic resolution 
Iijima, S 
1984 
Yes 
Japanese Journal of Applied Physics
ISSN: 0021-4922
EISSN: 1347-4065 
23 
6 
L347-L350 
English 
WOS:A1984TH91000001 
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. 
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