Analysis of vanadate compounds and glasses from the Cu-CdO-V ₂O₅ ternary system

By examining different compositions in the Cu-CdO-V₂O ₅ ternary system, a glass formation area along with a distinct type of vanadate compounds was found. Before fabrication of samples, depending on the proportion in weight of the used reactants the diagram of compositions was divided in three regions. Region I was established for samples with higher CdO content, region II was organized for samples whose glass former (V ₂O₅) content is the highest. As complement, region III was planned for samples with the highest Cu content. After fabrication of samples in region I, two types of materials were found, that is, within this region only amorphous materials were observed. Meanwhile, on the perimeter that surrounds such glass formation area, crystalline compounds like Cd₂V ₂O₇, and mixtures of phases of CuCd(VO₄), Cu₂O, and CdO, were found. As regards to region II, a mixture of vanadate compounds such as CdV₂O₆; Cu_.4V ₂O₅; Cu.₂₁₆(V₂O₅); and Cd_.73Cu_.27(V₂O₆) was identified. Additionally, in region III, solid solutions that involve compounds like Cu ₂O, CuO, CuCd(VO₄), and Cu₃VO₄ for each sample were registered. The crystalline state for each synthesized sample was determined by X-ray diffraction and corroborated by Raman spectroscopy.