Co－Sn替代钡铁氧体的制备及其磁性

The Prpearation and Magnetism of Co-Sn Substituted for Barium Ferrite

用化学共沉淀工艺制备了可望用作高密度垂直磁记录介质的Ｃｏ－Ｓｎ替代钡铁氧体系列微软样品ＢａＦｅ＿（１２－２ｘ）Ｃｏ＿ｘＳｎ＿ｘＯ＿（１９），其中ｘ可取值为０，０．２，０．４，０．５，０．６，０．８，１．２．给出了最佳制备条件：反应温度ｔ＝８０℃，体系的ｐＨ值ｐＨ＝１１．８，热处理温度Ｔ＿ｈ＝９２５℃。对所制备的系列样品进行了透射电镜（ＴＥＭ）观测和ｘ光衍射（ＸＲＤ）测试，给出了颗粒的形貌和大小以及晶体结构和晶格常数。用振动样品磁强计（ＶＳＭ）对宏观磁性进行了测试，给出了宏观磁性与替代浓度关系。

A series of Co-Sn substituted for barium ferrite BaFe_(12-2r)Co_xSn_xO_(19) Powder whichhave been shown a promising media for highdensity perpendicular magnetic recording is pre-pared by means of chemical coprecipitation with different substitution concentrations x being0,0.2,0.4,0.5,0.6,0.8,and 1.2,respectively.The optimum condition for preparation isobtained:the temperature of reaction being T=80℃, the pH value of reaction system beingpH=11.8,the heat treatment temperature being T_h=925℃。A combination of transmissiveelectron microscopy(TEM)and X-ray diffraction(XRD)is conducted to investigate the mor-phology,size,and the structure of the powder grains,The lattice constant is obtained。VSM is used to exatnine the macroscopic magnetism. The dependence of macroscopic mag-netism on the substitution concentration is obtained.