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- Title
Energy-Filtering Transmission Electron Microscopy (EF-TEM) Study of a Modulated Structure in Metakaolinite, Represented by 14 Å Modulation.
- Authors
Sujeong Lee; Youn Joong Kim; Hi-Soo Moon
- Abstract
For the first time, a periodicity of 14 Å is recognized as a typical modulation period in metakaolinite. Energy-filtered electron diffraction data confirm that dehydroxylation does not occur abruptly in kaolinite. The degree of ordering becomes much lower during the progression of dehydroxylation in metakaolinite than in kaolinite. However, different types of modulations, with periods in the range from ∼1.4d[sub 001] (9.47 Å) to 2.9d[sub 001] (19.89 Å), form along the c[sup *]-axis in metakaolinite. Modules (14.2 Å = 2.1d[sub 001]) that have a length that is approximately twice as long as the metakaolinite layer (6.86 Å) are the most common. Presumably, the remnant oxygens and vacant anion sites rearrange to acquire stability in the layer structure, which builds modulations along the c[sup *]-axis in the metakaolinite.
- Subjects
KAOLINITE; TRANSMISSION electron microscopy
- Publication
Journal of the American Ceramic Society, 2003, Vol 86, Issue 1, p174
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1151-2916.2003.tb03297.x