Proefschrift Rijksuniversiteit Groningen. / Met lit. opg. - Met een samenvatting in het Nederlands.

Die Arbeit beschäftigt sich mit der Rolle der Atomcluster in den ikosaedrischen Quasikristallen. Untersucht werden dabei Eigenschaften der Zustandsdichte, der Leitfähigkeit und des Stabilisierungsverhaltens.

Die Arbeit beschäftigt sich mit der Rolle der Atomcluster in den ikosaedrischen Quasikristallen. Untersucht werden dabei Eigenschaften der Zustandsdichte, der Leitfähigkeit und des Stabilisierungsverhaltens.

Frequent systematic misindexing of electron backscatter diffraction patterns with five differently oriented pseudosymmetric solutions was observed for the cubic α-Al(Fe,M)Si phase with M = Mn, Cr encountered in secondary Al-Si casting alloy. That misindexing can be ascribed to the close structural relationship of the cubic crystal structure of α-Al(Fe,M)Si to that of the corresponding icosahedral quasicrystal. Robust identification of the correct among the five nearby solutions during automatic indexing can be achieved, which sensitively depends on the accuracy of Kikuchi-band detection applying Hough-space related indexing methods. Based on the correct crystallographic orientation solution, facets of the particles with bulk polyhedral and Chinese script morphology were determined to be {110} planes. Likewise, the habit planes of the α-Al(Fe,M)Si phase particles located at the naturally occurring oxide film are {110} planes.