Synthesis RMn_2O_5 (R = Gd and Sm) nano- and microstructures by a simple hydrothermal method

摘要

Single-phase RMn_2O_5 (R = Gd and Sm) nano- and microstructures have been successfully synthesized via a simple hydrothermal process at 250℃ for 24h using NaOH as mineralizer. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and selective area electron diffraction patterns (SAED) were used to characterize the as-synthesized GdMn_2O_5 and SmMn_2O_5 samples. The effect of NaOH concentration and the molar ratio of Mn~(2+)/Mn~(7+) on the morphology and size of the final products was studied, and a possible formation mechanism of RMn_2O_5 (R = Gd and Sm) nanoplates and nanorods under hydrothermal conditions was proposed.