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Preparation of α-Fe_2O_3 Nano-particles from Condensed Fe(OH)_3 Gel by Hydrothermal Method

SHI Xin-yu,WU Dong-hui,ZHANG Zhong-xiu,SHI Lei(School of Chemistry and Chemical Engineering,Nantong University,Nantong 226007,China)  
The effects of pH values of precursors using Fe(NO3)3 as materials neutralized by NH3·H2O to form Fe(OH)3 condensed gel on the morphology of α-Fe2O3 nano-particles prepared by hydrothermal method were studied.When pH value was 3 or 5,the particles were spherical with porous structure.When pH value was 7,the particles were rhombohedral.When pH value was 9,the morphology of particles converted from rhombohedral to spherical shape.The products were single crystal particles and were distributed uniformly with small particles under the above experimental conditions.The effect of pH values of precursors on the morphology and sizes of particles was also analyzed.
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