Low-dimensional -Mn 2 O 3 materials with novel surface morphologies have been prepared by thermal decomposition of hydrothermal-derived MnCO 3 . The powder X-ray diffraction pattern reveals that the Mn 2 O 3 microstructures are of cubic phase structure. From Fourier transform infrared spectroscopy results, the peaks around 600-450 cm À1 correspond to Mn-O bending vibrations. From the TGA results, the observed major weight loss $31% between 350 and 540 C is due to the decomposition of MnCO 3 into Mn 2 O 3 . The X-ray photoelectron spectroscopy results showed that Mn is in þ3 oxidation state. The peaks at 641.2 and 652.73 eV are assigned to the Mn2p 3/2 and Mn2p 1/2 of Mn þ3 states, respectively . The scanning electron microscope images showed that the -Mn 2 O 3 products exhibit spheres, dumbbell-and peanut-shaped microstructure. These microstructures are mainly composed of wires/rods and particles. The scanning electron microscope results also revealed that the obtained -Mn 2 O 3 maintains the frame structure of the precursor MnCO 3 .