Solid state and hydrothermal synthesis, characterization and optical properties of Yb2V2O7

Yb2V2O7 nano-powders were synthesized via solid state and hydrothermal reactions using Yb2O3 and Na2VO4 at stoichiometric 1:1 Yb:V molar ratio as raw materials for the first time. The synthesized materials were characterized by powder X-ray diffraction (PXRD) technique. Structural analysis was performed by FullProf program employing profile matching with constant scale factors. The results showed that the patterns had a main Yb2V2O7 structure with a space group of . Besides, the data revealed that the reaction conditions affected the physical property and crystal phase growth of the obtained materials. FESEM images showed that the synthesized Yb2V2O7 particles had mono-shaped sphere morphologies. Ultraviolet–visible spectroscopy (UV-Vis) analysis showed that the nanostructured Yb2V2O7 powders possessed strong light absorption properties in the ultraviolet-visible light region. The direct optical band gaps were 3.90, 4.10, 4.15, and 4.35 eV for S1, S2, S3, and S4, respectively. Electrochemical property of Yb2V2O7 nanoparticle was studied by cyclic voltammetry (CV) technique in NaOH electrolyte medium.