高纯纳米α-Fe₂O₃粉体的制备及表征

来源期刊：中南大学学报(自然科学版)2006年第3期

论文作者：阳征会 龚竹青 马玉天 杨余芳 李宏煦

文章页码：487 - 492

关键词：纳米粉体;沉淀法;表面活性剂;高纯α-Fe2O3

Key words：nanoparticles; precipitation; surfactants; high-purity α-Fe₂O₃

摘    要：以黄钠铁矾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600~800℃热处理2 h的产物是α-Fe₂O₃,晶核生长活化能为12.4 kJ/mol,颗粒均匀呈球形,粒径小于100 nm,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。

Abstract: α-Fe₂O₃powder were prepared by precipitation method using FeSO₄ purified from sodium jarosite’s slag as starting materials, and were characterized by X-ray diffraction, TG-DTA 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.

基金信息：国家自然科学基金资助项目