This study used the maximum entropy method with synchrotron radiation powder data to examine the bonding nature of icosahedral clusters of 12 atoms in nonmetallic α-AlMnSi 1/1-cubic approximant phase and 13 atoms in metallic Al12Re phase, respectively. Regarding α-AlMnSi, the origin of the pseudogap is considered to be due to the covalent bonds rather than the Hume-Rothery mechanism. In the icosahedral Al12 cluster with central Re atom, the enhancement of electrical resistivity with increasing concentration of transition metals is due to the enhanced covalency between Al and transition metal.
ASJC Scopus subject areas
- Physics and Astronomy(all)