Abstract
It has been demonstrated that apart from the known compounds YbVO4 and Yb8V2O17, a substitutive solid solution is also formed in the binary oxide system V2O5–Yb2O3. This solid solution is characterized by limited solubility of vanadium(V) oxide in the crystal lattice of ytterbium oxide, and its general formula is Yb2−5x□2xV3xO3, where 0.00 < x < 0.1667. The new solid solution was obtained from the mixtures of V2O5 and Yb2O3 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 Yb2O3. 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 Yb3+ replacement with V5+ in the crystal lattice of Yb2O3. 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.
Highlights
IntroductionSol–gel method, suspension, combustion, Pechini method, hydrothermal method, sonochemical method and still too little appreciated mechanochemical method
Intensive search for new advanced materials for application in, e.g., optics, electronics and informatics has been conducted for many years
To the best of our knowledge, there is no information on the solid solutions forming in the binary system of V2O5 and Yb2O3 oxides showing the structures of vanadium(V) oxide and/or ytterbium oxide
Summary
Sol–gel method, suspension, combustion, Pechini method, hydrothermal method, sonochemical method and still too little appreciated mechanochemical method. Taking into account the hitherto knowledge on the compounds forming in the system V2O5–Yb2O3, and in particular, the lack of information on the synthesis of YbVO4 and Yb8V2O17 by mechanochemical method (MChS), the aim of the study reported here was to establish the type of compounds and/or phases forming in this system in the entire range of concentration of its components as a result of reactions induced by high-energy ball milling. If as a result of this process new compounds and/or solid solutions are obtained, our additional objectives will be to characterize their structures and properties, in particular thermal stability and optical properties, and to compare them with the properties of the phases obtained in the high-temperature reactions (HTS) taking place in the system studied in solid state. The spectra were recorded in the wavelength region of 200–750 nm at room temperature
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