Abstract
New Dion-Jacobson type layered perovskite compounds A'Ln2Ti2NbO10 (A′ = Rb, H; Ln = Pr, Nd) were synthesized for the first time. The phase and chemical purity of the compounds were proved by X-ray diffraction (XRD) and EDX. Compounds RbPr2Ti2NbO10 and RbNd2Ti2NbO10 were synthesized using solid-state reactions, whereas HPr2Ti2NbO10·1.5H2O and HNd2Ti2NbO10·2H2O were obtained from Rb-containing phases by ion-exchange reactions. Crystal structures of RbPr2Ti2NbO10 (P4/mmm, a = 0.38223 (1) nm, c = 1.51485 (8) nm, Rwp = 3.87%) and RbNd2Ti2NbO10 (P4/mmm, a = 0.38153 (1) nm, c = 1.51200 (6) nm, Rwp = 3.62%) were refined using the Rietveld method. The distortions of polyhedrons in the structures were studied in detail. The thermal behavior of compounds was established using DTA. The ion-exchange products were found to be metastable hydrates. Optical band gap, valence band edge and conduction band edge potentials of obtained compounds were calculated from diffuse reflectance spectroscopy data. Photocatalytic experiment of methylene blue degradation under ultraviolet (UV) light was conducted with ground synthesized compounds. The particle size distributions were measured by laser diffraction before and after grinding. RbNd2Ti2NbO10 showed the highest photocatalytic activity, while HPr2Ti2NbO10·1.5H2O and HNd2Ti2NbO10·2H2O showed none.
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