Abstract
Large sized sphere—like polyhedrons of Cr2O3 were prepared via hydrothermal synthesis under the assistance of the surfactant cetyltrimethylammonium bromide (CTAB). The Starting materials were K2Cr2O7 and HCHO. When the amount of CTAB changed from 0.15 to 0.01g and the amount of K2Cr2O7 kept 3.5g, morphologies of products changed in sequence. And 0.05g CTAB corresponded to the 38–72µm sphere -like polyhedrons of Cr2O3. The amount of K2Cr2O7 also led to obvious changes of morphologies. The above experimental phenomena are assigned to influences of amounts of the added surfactant and reactant on the nucleation and diffusion rate, which lead to different morphologies of products. Phase purity and composition of precursor and products were investigated by X-ray techniques (XRD), and microstructures were observed by field emission scanning electron microscope (SEM)
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