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Physical boundaries within aggregates – differences between amorphous, para‐crystalline, and crystalline Structures
Author(s) -
Albers Peter,
Maier Monika,
Reisinger Martin,
Hannebauer Bernd,
Weinand Rudolf
Publication year - 2015
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201570019
Subject(s) - crystallite , amorphous solid , nanoscopic scale , nanometre , materials science , aggregate (composite) , chemical engineering , phase (matter) , mineralogy , particle (ecology) , grain boundary , crystallography , nanotechnology , microstructure , chemistry , composite material , metallurgy , geology , organic chemistry , oceanography , engineering
SEM images of isolated aggregates of silica and titania show structural similarities at the several hundred nanometer scale (red). However, high resolution TEM reveals distinct differences of the interior structure down to the nanoscale. Pyrogenic titania entities are formed by intergrown crystallites (blue). Grain or solid phase boundaries are detected. Synthetic silicas of different production technology are completely amorphous (green) and, thus, the aggregate is the constituent particle. This conclusion is confirmed by 3D‐TEM investigations. (Picture: P. Albers et al., 10.1002/crat.201500040 pp. 846–865, in this issue)