非晶态δ-FeOOH液相合成纳米级α-Fe_2O_3粉体的历程研究  

Research on the Mechanism of the Formation of Nanoparticle of α-Fe_2O_3 Powder in Aqueous Solution with Amorphous δ-FeOOH

作　　者：孟哲[1] 贾振斌[2] 魏雨[2] 

机构地区：[1]河北邢台学院化学系,邢台054001 [2]河北师范大学化学学院,石家庄050016

出　　处：《化学学报》2004年第5期485-488,共4页Acta Chimica Sinica

基　　金：河北省自然科学基金 (No.50 1 1 1 5)资助项目

摘　　要：以非晶态δ FeOOH为前驱物的弱酸性悬浮液 ,液相快速合成粒径小于 2 5nm、准球形、高纯度α Fe2 O3 粉体 .结合XRD ,FTIR ,TEM ,TG/DTA和粒度分析等测试手段 ,对δ FeOOH液相相转化为α Fe2 O3 过程中产物的物相、结构及形貌进行了表征 .研究结果表明 ,非晶态δ FeOOH属亚稳相 ,容易向稳定相α Fe2 O3 及α FeOOH转化 ,而α FeOOH在沸腾回流中会自发地转化为α Fe2 O3 .Ultrafine α-Fe_2O_3 powder, with spherical shape, high purity and a diameter of less than 25 nm, formed rapidly in weak acid suspension by using amorphous δ-FeOOH as precursor. The phase, structure and shape of the product were characterized by XRD, FTIR, TEM, TG/DTA and size-analysis. It is revealed that amorphous δ-FeOOH is sensitive to heat and transfers to stable α-Fe_2O_3 and α-FeOOH much easily, while α-FeOOH can spontaneously transfer to α-Fe_2O_3 under refluxing.

关 键 词：纳米级铁红粉体 结构 相转化 前驱物 液相合成 铁黄粒子 羟基氧化铁 非晶态δ-FeOOH 

分 类 号：O614[理学—无机化学]