New Solid Solution and Phase Equilibria in the Subsolidus Area of the Three-Component CuO-V2O5-Ta2O5 Oxide System

The results of the study of the three-component system of CuO-V2O5-Ta2O5 oxides showed, inter alia, that in the air atmosphere in one of its cross-sections, i.e., in the CuV2O6-CuTa2O6 system, a new substitutional solid solution with the general formula CuTa2-xVxO6 and homogeneity range for x > 0.0 and x <= 0.3 is formed. The influence of the degree of incorporation of V5+ ions into the CuTa2O6 crystal lattice in place of Ta5+ ions on the unit cell volume, thermal stability and IR spectra of the obtained solid solution was determined. Moreover, the value of the band gap energy of the CuTa2-xVxO6 solid solution was estimated in the range of 0.0 < x <= 0.3, and on this basis, the new solid solution was classified as a semiconductor. On the basis of the research results, the studied system of CuO-V2O5-Ta2O5 oxides was also divided into 12 subsidiary subsystems.

Automated summary

The study of CuO-V2O5-Ta2O5 oxides revealed the formation of a new substitutional solid solution in the CuV2O6-CuTa2O6 system under air atmosphere. The solid solution exhibited semiconductor properties and the overall system was divided into 12 subsidiary subsystems.