氧缺位铁酸盐MFe_2O_(4-δ)的制备条件研究  

Studies on the Conditions for the Formation of Oxygen deficient Ferrites MFe 2O 4 δ

作　　者：王力军[1,2] 张春雷[1,2] 李爽 吴通好[1,2] 彭少逸 

机构地区：[1]渝州大学化学系 [2]吉林大学化学系

出　　处：《功能材料》1997年第4期421-426,共6页Journal of Functional Materials

摘　　要：使用ＸＲＤ、Ｍｏｓｓｂａｕｅｒ谱结合化学分析考查了５７３Ｋ下还原时间对空气氧化碱性悬浮液合成的铁酸盐ＭＦｅ２Ｏ４＋δ（δ≥０）的物相、晶格常数及化学组成的影响，得出了制备氧缺位铁酸盐ＭＦｅ２Ｏ４－δ（δ＞０）的最佳条件。结果表明，在５７３Ｋ下制备ＭＦｅ２Ｏ４－δ的最佳还原时间按Ｆｅ、Ｃｏ、Ｍｎ、Ｎｉ顺序分别为１０ｈ、３ｈ、４０ｍｉｎ和３０ｍｉｎ，氧缺位程度及晶格常数在最佳还原时间之前随还原时间增长而增大，在接近最佳还原时间时达到极大值。ＭＦｅ２Ｏ４－δ的极大值δ按Ｆｅ、Ｃｏ、Ｍｎ、Ｎｉ顺序减小，超过最佳还原时间ＭＦｅ２Ｏ４－δ将分解为α－Ｆｅ（Ｍ＝Ｆｅ）或ＭＯ－ＦｅＯ（Ｍ＝Ｃｏ、Ｍｎ、Ｎｉ）。The effects of different reduction time at 573K on the phase, lattice constant and chemical composition of ferrites MFe 2O 4+δ (δ≥0),which was obtained by the air oxidation of the suspension were investigated by XRD, Mossbauer and chemical analyses. The optimum conditions of preparation of the oxygen deficient ferrites MFe 2O 4-δ (δ>0) was obtained. The results showed that the optimum reduction time of prepared MFe 2O 4-δ at 573K are 10h, 3h,40min and 30min in the order of Fe,Co,Mn,Ni,respectively,the oxygen deficient degree and lattice constant were increased with the increase of reduction time before the optimum reduction time. The maximum δ value of MFe 2O 4 δ was decreased in the order of Fe, Co, Mn,Ni and MFe 2O 4 δ was decomposed into α Fe (M=Fe) or MO FeO (M=Co,Mn,Ni) in excess of the optimum time.

关 键 词：氧缺位铁酸盐 制备条件 XRD 铁氧体 

分 类 号：TM277[一般工业技术—材料科学与工程]