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The presented work encompasses the subject of the studies and the results obtained over the last years by the research workers of the Department of Inorganic Chemistry. They include mainly the studies on the reactivity of metal oxides, searching for new phases in binary and ternary systems of metal oxides as well as describing phase relations establishing in such systems. They also encompass works on the extensive characteristics of physico-chemical properties of the newly obtained compounds

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In this paper, we report results of thermoanalytical investigation on the reaction between ZrOCl 2 Á8H 2 O and (NH 4 ) 2 HPO 4 in molar ratio 1:2. Differential thermalthermogravimetric and X-ray diffraction analyses were performed in order to reveal the chemical transformations, which took place during heating of the individual compounds ZrOCl 2 Á8H 2 O, (NH 4 ) 2 HPO 4 and the mixture ZrOCl 2 Á8H 2 O:2(NH 4 ) 2 HPO 4 . It was shown that the transformations in the mixture below 160°C were connected with dehydration of ZrOCl 2 Á8H 2 O and interaction between the components of the mixture, which resulted in the formation of NH 4 Cl, NH 4 H 2 PO 4 and a mainly amorphous zirconium phase, most likely t-ZrO 2 . The zirconium component subsequently reacted with ammonium dihydrophosphate (below 200°C) or with dehydrated phosphate derivatives (above 200°C), which in both cases yielded an amorphous product. The interaction between the components of the mixture resulting in the formation of ZrP 2 O 7 was completed by its crystallisation at 610°C. Our study indicates an alternative low-temperature approach for the synthesis of the technologically important ZrP 2 O 7 material.

Phase equilibria up to solidus line in CuOIn 2 O 3 system have been investigated using XRD and DTA/ TG methods. According to the results, only one compound of the formula Cu 2 In 2 O 5 formed in the system studied. Its thermal stability was determined in the air and argon proving that the compound did not melt but underwent decomposition. The decomposition of Cu 2 In 2 O 5 in the air atmosphere began at 1080°C, while in argon at 835°C. Additional studies were undertaken to determine the hitherto unknown colour properties of samples representing the CuO-In 2 O 3 system in the equilibrium state.

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