BixLa1−xVO4 solid solutions: tuning of electronic properties via stoichiometry modifications

摘要: BixLa1−xVO4 solid solutions were obtained in the form of fine powder via a microwave-assisted hydrothermal route. The presence solution studied system was confirmed using X-ray diffraction (XRD) and optical spectroscopy techniques. Pure BiVO4 LaVO4 monoclinic form, whereas tetragonal, zircon-type structure. band gap dependence on composition is parabolic, thus there possibility to tune this parameter wide concentration range, from 2.4 4.0 eV. An absorption coefficient maximum also concentration-dependent, possibly, due structural disorder samples. Solid with Bi3+ between 11.94 32.57 at.% exhibit intense, green luminescence. This indicates Bi-originated electronic states within gap. value conduction edge potential, measured by both electrochemical impedance work function measurements, concentration-independent. Moreover, photoelectrochemical photocurrent switching effect, they may be promising materials for molecular electronics as dioxygen activators.