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Energy‐Filtering Transmission Electron Microscopy (EF‐TEM) Study of a Modulated Structure in Metakaolinite, Represented by a 14 Å Modulation
Author(s) -
Lee Sujeong,
Kim Youn Joong,
Moon HiSoo
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03297.x
Subject(s) - kaolinite , transmission electron microscopy , materials science , layer (electronics) , diffraction , modulation (music) , electron diffraction , crystallography , mineralogy , chemistry , composite material , optics , nanotechnology , physics , acoustics
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 ∼1.4 d 001 (9.47 Å) to 2.9 d 001 (19.89 Å), form along the c *‐axis in metakaolinite. Modules (14.2 Å= 2.1 d 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 *‐axis in the metakaolinite.