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Structural Studies of Jennite and 1.4 nm Tobermorite: Disordered Layering along the [100] of Jennite
Author(s) -
Viehland Dwight,
Yuan Lijian J.,
Xu Z.,
Cong XianDong,
Kirkpatrick R. James
Publication year - 1997
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.1151-2916.1997.tb03228.x
Subject(s) - layering , streaking , tobermorite , transmission electron microscopy , diffraction , materials science , silicon , crystallography , lattice (music) , electron diffraction , mineralogy , condensed matter physics , optics , chemistry , physics , nanotechnology , biology , botany , cement , acoustics , metallurgy
Transmission electron microscopy of synthetic jennite reveals strong streaking in the electron diffraction patterns along the [100], along which dark‐field imaging and lattice fringing confirm the presence of a layering with a striation‐like morphology. The average periodicity between the layers is ∼35 Å; however, there is significant variation around this value in the range of 20‐40 Å, which is in agreement with the range of periodicities that are associated with the streaking in the diffraction patterns. These results clearly demonstrate the presence of a layering along the [100] with a periodicity that varies spatially throughout the specimen, which results in the presence of a disordered modulated structure. We believe that the disorder is induced by frozen‐in fluctuations in the local calcium:silicon ratio, which correspondingly results in fluctuations in the local structural order and periodicity of the modulated structure. Similar studies of 1.4‐nm tobermorite have revealed streaking along the [100]; however, it was weak and diffuse.