Nano powders Eu3+ and Nd3+ - doped Sr2Nb2O7 were prepared by a low temperature hydrothermalmethod at 120 ºC for 48 h followed by annealing at 400 ᵒC for 3 h among Sr(NO3)2and Nb2O5, Eu2O3 and Nd2O3 raw materials at stoichiometric 1:1 Sr:Nb molar ratio. Characterizationof the synthesized materials was performed by X-ray powder diffraction (XRPD)technique. FullProf program employing profile match...

Oxide materials with a perovskite-derived layered structure often show better photocatalytic performance compared to nonlayered of similar composition. Here we investigate the catalytic activity for oxygen evolution reaction (OER) on surfaces Carpy–Galy oxides Sr2Ta2O7 and Sr2Nb2O7. We find that (010) surface parallel layering shear plane is not relevant photocatalysis. The (100) perpendicular ...

It has previously been shown that the dipolar field effect spatially localizes photochemical reaction products on the surfaces of macroscopic ferroelectric crystals. In this work, photochemical reactions that deposit insoluble products on the surface have been used to study the dipolar field effect in microcrystals of BaTiO3 and Sr2Nb2O7. In both cases, the patterns of reduced silver on the sur...