Fe(Ⅱ)浓度及pH值对γ-FeOOH相转化为α-Fe_2O_3时间的影响  

Influence of Concentration of FeSO_4 and pH Values on Transformation Time of Lepidocrocite to Hematite

作　　者：马子川[1] 魏雨[2] 郑学忠[2] 郭祀远[1] 

机构地区：[1]华南理工大学轻化工研究所,广州510641 [2]河北师范大学化学系

出　　处：《磁性材料及器件》1998年第2期43-45,49,共4页Journal of Magnetic Materials and Devices

摘　　要：研究了FeSO4浓度及pH值对γ－FeOOH在99℃±1℃陈化时相转化为α－Fe2O3时间的影响。结果表明，［Fe（Ⅱ）］／［Fe（Ⅲ）］为0．03～0．05及pH值为近中性时相转化时间最短。指出Fe（Ⅱ）离子对γ－FeOOH的促进作用为FeOH＋吸附在γ－FeOOH表面促使其溶解造成的。In this paper, effects of FeSO4 concentration and pH values on the transformation of γ-FeOOH to α-Fe2O3 in suspensions were studied by aging the γ-FeOOH suspensions at 99±1℃. The results showed that the transformation period reached minimum at nearneutral pH when [Fe(Ⅱ)]/[Fe(Ⅲ)]= 0. 03～0. 05. It indicates that acceleration of Fe (Ⅱ) ions on the transformation is caused by an increase in the dissolution rates of γ-FeOOH particles due to adsorption of FeOH+ ions on the surface of the γ-FeOOH particles.Keywrods: WORDS α-Fe2O3, γ-FeOOH, phase transformation

关 键 词：相转化 磁粉 磁记录介质 

分 类 号：TQ586.1[化学工程—精细化工] TM272[一般工业技术—材料科学与工程]