Homologue scheelite crystals CaWO4, SrWO4, and BaWO4 possess similar crystal and electronic structure, but their luminescence exhibits drastically different thermal stabilities. By measuring the temperature dependence of the decay time of the intrinsic luminescence and fitting it to a three level model, we have qualitatively shown the effective exciton radius to increase in the order CaWO4 → Sr...

A simple co-presipitation method has been developed to synthesize SrWO4 and Ag°-SrWO4 micro/nanostructures with different morphologies, including platelet-, star- and flower-like, in the presence of Na(B(C6H5)) as surfactant. The formation of platelet-, star- and flower-like shapes of particulate system was examined by electron microscopy technique. The products were characterized by X-ray diff...

Phase-pure scheelite AMoO4 and AWO4 (A = Ba, Sr, Ca) were thermally treated under an ammonia atmosphere at 400 to 900 °C. SrMoO4 and SrWO4 were shown to convert into cubic perovskite SrMoO2N and SrWO1.5N1.5, at 700 °C and 900 °C respectively, and to form metastable intermediate phases (scheelite SrMoO4-xNx and SrWO4-xNx), as revealed by X-ray diffraction (XRD), elemental analysis and FTIR spect...

New cation deficient tetragonal scheelites, (Sr,Ce)nWO4 (n ​< ​1) were synthesized using the Ethylene-DiamineTetraacetic Acid-citrate method. The chemical compositions and homogeneity of powders determined by Energy Dispersive Spectroscopy. Whatever cerium amount, scheelites exhibit (3 ​+ ​2)D incommensurate modulations, which evolve with structural cations vacancies amount. optical absorption ...

SrWO(4) powders were synthesized by the co-precipitation method and processed in a microwave-hydrothermal (MH) at 140 degrees C for different times. The obtained powders were analyzed by X-ray diffraction (XRD), micro-Raman (MR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, field-emission gun scanning electron microscopy (FEG-SEM), ultraviolet-visible (UV-vis) absorption spectr...

Hydrogen is a great sourcez of energy due to having zero emission carbon-based contents. It found primarily in water, which abundant and renewable. For electrochemical splitting water molecules, it necessary use catalytic materials that minimize consumption. As famous carbon material, graphitic nitride, with its excellent physicochemical properties diversified functionalities, presents potentia...