Abstract
Investigations on heterogeneous solid-state reactions comprising compositional, structural and morphological changes as well as concomitant alterations of the physical properties are presented. Owing to the fact that mere thermoanalytical techniques yield only limited results, independent complementary methods of investigations, such as X-ray diffractometry, light and electron microscopy, as well as spectroscopic techniques are applied in order to achieve a consistent interpretation of the course of the processes investigated, as well as of the properties of the products formed. Due attention is paid to the role of inert or reactive gas atmospheres. The reactions studied comprise thermal degradations of pure and mixed alkaline-earth/transition metal carbonates in various gas atmospheres as well as thermal reduction/reoxidation processes of perovskite-type and delafossite-type metal oxides. The importance of the investigated compounds in the field of heterogeneous catalysis and of materials with specific magnetic or electronic properties, such as semi- or super-conductors, is discussed.
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