超细Fe_2O_3粉末的结构及热稳定性  

Structure and thermostability properties of ultra-fine hematite

作　　者：孙菲[1] 刘旭隆[1] 王秀[1] 李秋菊[1] 洪新[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《粉末冶金材料科学与工程》2013年第2期290-295,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(50474081)

摘　　要：采用差示扫描量热仪（DSC）和X射线衍射分析（XRD），研究超细Fe2O3粉末的热稳定性及晶体结构随颗粒尺寸的变化关系。研究结果表明：超细Fe2O3粉末在1000～1400℃之间会发生分解反应，生成Fe3O4。随Fe2O3颗粒粒径减小，此分解过程产生的热量减小；反应的起始温度也随颗粒粒径的减小逐渐降低，但降低的幅度渐小；晶粒粒径越小，晶格内的相关点阵参量越易发生微小变化，使晶胞出现略微膨胀的现象。Fe：0，粉末加热时因颗粒粘结引发颗粒粒径长大，但对晶粒粒径的影响不大。The crystal structure and thermal stability of hematite with various particle sizes were studied using differential scanning calorimetry （DSC） and X-ray diffraction analysis （XRD）.The decomposition reaction of hematite occurs in the range from 1 000 ℃ to 1 400 ℃, and the main product is Fe3O4. With decreasing Fe2O3 particle size, the heat value of the reaction and the initial decomposition temperature decrease. At the same time, there is some small change for the lattice parameters of Fe2O3 particle with various sizes, and the unit cell will be a slight expanding, and the smaller the particle size the smaller the crystal size. The bond between particles will lead to the increase of the Fe2O3 particle size, but has little effect on crystal size.

关 键 词：超细Fe2O3粉 晶体结构 热稳定性 差热分析 

分 类 号：TF12[冶金工程—粉末冶金]