Abstract
Single-phase RMn 2O 5 (R = Gd and Sm) nano- and microstructures have been successfully synthesized via a simple hydrothermal process at 250 °C for 24 h 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.
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