作　　者： ; ;

机构地区： 华南理工大学轻工与食品学院轻化工研究所

出　　处： 《磁性材料及器件》 1998年第2期43-45,49,共4页

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

领　　域： [化学工程] [电气工程] [一般工业技术]