Twofold Axis in Crystals - Practical Electron Microscopy and Database - - An Online Book - |
||||||||
Microanalysis | EM Book https://www.globalsino.com/EM/ | ||||||||
================================================================================= | ||||||||
Figure 1619a shows examples of two-fold rotation axis in crystallography. Figure 1619a. Examples of two-fold rotation axes (from x, y, z to -x, -y, z.). Figure 1619b (a) shows a two-fold axis, and Figure 1619b (b) shows the two-fold, three-fold and four-fold axes in a cubic structure. Figure 1619b. (a) A two-fold axis, and (b) The two-fold, three-fold and four-fold axes in a cubic structure. A vertical glide plane results in a mirror line in the CBED pattern. At Bragg condition, a horizontal twofold axis or twofold screw axis in the ZOLZ along g presents a mirror line of symmetry onto disk g, and this line runs normal to g.
|
||||||||
================================================================================= | ||||||||
|
||||||||