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Nanoscopic unequivocal analysis of twinned crystal structures with tetragonal or orthogonal unit cells by electron microdiffraction
Author(s) -
Leicht M.,
Remmele T.,
Stenkamp D.,
Strunk H. P.
Publication year - 1999
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889898014290
Subject(s) - crystal twinning , tetragonal crystal system , materials science , crystallography , electron diffraction , crystal structure , chalcogenide , superstructure , transmission electron microscopy , crystal (programming language) , diffraction , condensed matter physics , optics , nanotechnology , chemistry , microstructure , optoelectronics , physics , programming language , computer science , thermodynamics
In this study, a particular type of nanoscopic twinned crystal structure which can occur in any tetragonal or orthogonal crystal structure with a ratio of lattice parameters is presented. This type of twinning is characterized by twin components whose c axes are oriented perpendicular to one another, by twin‐habit planes parallel to {102} planes, and by a superstructure along the twin boundaries which is described by orthogonal unit cells with lattice parameters 2 a , 2 a , a . Furthermore, the suitability of electron microdiffraction, a diffraction technique of transmission electron microscopy (TEM) with a moderately convergent beam, for the analysis of such twinned crystal structures is demonstrated. For this demonstration, electron microdiffraction is applied to the chalcogenide compound Cu 2 In 3 Se 5 , which indeed exhibits the proposed twinned crystal structure.