Thin One-Dimensionally Disordered 1DD layers
6H
one dimensionally disordered layer ~ 40 µm
6H
Thin disordered layers produce diffuse streaking along the diffraction rows, visible as clear absences in (non central) polytype reflections at their location along the edge of the crystal.
Sample J6 model: 6H+1DD+6H classified as a simple sandwich
Features: 1DD layer measured as 40 µm thick Defect band in 5270 central reflection at the site of the 1DD layer Defect bands are often associated with 1DD layers
1DD layers and clues from the edge morphology aid in constructing models of the polytype content of multipolytypic SiC.