High-resolution electron microscopy and domain structures of pentagonal Frank-Kasper phases

The Laboratory of Atomic Imaging of Solids is dedicated to the direct imaging of materials in various fields of solid-state sciences at the atomic or molecular level. The main programs of this laboratory are briefly described, including quasicrystals, new phases and microdomains in Frank-Kasper phases, suboxides of metals, catalysts, minerals found in China, and molecular structure of organic substances. A recent systematic investigation of domain structures consisting of juxtaposed icosahedral columns is also presented.

Two new SiC polytypes belonging to the [(44) n 43]3 structure family

Using a modified Laue method as well as electron diffraction and lattice image methods, two new poly types of SiC, 93R and 261R, have been found which belong to a new structure family [(44) n 43]3 based on 8H (44) stacking.