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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It has been demonstrated that apart from the known compounds YbVO 4 and Yb 8 V 2 O 17 , a substitutive solid solution is also formed in the binary oxide system V 2 O 5 -Yb 2 O 3 . This solid solution is characterized by limited solubility of vanadium(V) oxide in the crystal lattice of ytterbium oxide, and its general formula is Yb 2-5x h 2x V 3x O 3 , where 0.00 \ x \ 0.1667. The new solid solution was obtained from the mixtures of V 2 O 5 and Yb 2 O 3 oxides, containing vanadium(V) oxide in the amounts not exceeding 30 mol%, by high-energy ball milling in a planetary ball mill. The solid solution obtained was characterized using the methods XRD, DTA-TG, SEM, IR and UV-Vis-DR. It was found to crystallize in cubic system and to show a structure of Yb 2 O 3 . This solid solution was stable in air atmosphere at least up to * 800°C, and the temperature of its decomposition decreased with increasing x, so with increasing degree of Yb 3? replacement with V 5? in the crystal lattice of Yb 2 O 3 . The energy gap estimated for this solid solution varied from * 2.5 eV for x = 0.0322 to * 2.6 eV for x = 0.1176, which means that this new solid solution is a semiconductor.

Abstract:Using the XRD method a comparative study was performed on the reactivity of commercial T-

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