高纯纳米α-Fe_2O_3粉体的制备及表征  

Preparation and characterization of high-purity α-Fe_2O_3 nanoparticles

作　　者：阳征会[1] 龚竹青[1] 马玉天[1] 杨余芳[1] 李宏煦[2] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]北京有色金属研究总院,北京100088

出　　处：《中南大学学报（自然科学版）》2006年第3期487-492,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50204001)

摘　　要：以黄钠铁矶渣制取的硫酸亚铁溶液为原料，经过净化后采用沉淀法制备α-Fe2O3微粉。通过热重／差热分析、X射线衍射分析、扫描电镜和光谱分析等测试手段，对α-Fe2O3微粉进行表征。研究结果表明：前驱体FeCO3在600800℃热处理2h的产物是α-Fe2O3，晶核生长活化能为12．4kJ／mol，颗粒均匀呈球形，粒径小于100nm，杂质含量低纯度高；在沉淀过程中加入分散剂和表面活性剂，抑制了前驱体FeCO3颗粒的长大和团聚，制备的α-Fe2O3粒径小，粒径分布范围窄。α-Fe2O3 powder were prepared by precipitation method using FeSO4 purified from sodium jarosite’s slag as starting materials, and were characterized by X-ray diffraction, TCrDTA analysis and SEM photograph. The results show that uniform and spherical α-Fe2O3 nanoparticles with high purity are obtained by FeCO3 precursors calcinated for 2 h at 600-800℃, the growth activation energy of grains is 12.4 kJ/mol. The presence of dispersive agents and surfactants in process of precipitation can control the growth and aggregation of FeCO3 grains, so that the synthesized α-Fe2O3 powders have a size smaller than 100 nm and a narrow size distribution range, and a high purity.

关 键 词：纳米粉体 沉淀法 表面活性剂 高纯α-Fe2O3 

分 类 号：TQ138.11[化学工程—无机化工]