Dokument

Summary:
The present dissertation describes the atomic structures of two systems of ternary chalcogenide glasses with the composition Agx(GeSe3){1-x} and (GeTe){1-x}(Sb2Te3){x}. To be able to gain new insight especially in the structures on intermediate length scales, the method of anomalous x-ray scattering (AXS) in combination with Reverse Monte Carlo modelling (RMC) is applied. The theoretical and experimental basis for the interpretation of the scattering data is given in the first part of the work, whereas the results of the experiment and the RMC modelling are presented and discussed in the second part. Both systems under investigation are of distinct technological importance, hence reliable information on their structure is needed in order to contribute to the ongoing discussion about their structure-property relations. The results are presented within the framework of the various other investigations already published on these materials, and the possibilities and limitations of the different applied approaches are discussed. Thereby, it is shown that important features of the materials, like the phase-change properties of the GeSbTe glasses and the superionic conductivity in the AgGeSe glasses, are closely connected not only to the near-, but also to the intermediate-range order in the amorphous structures.

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