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采用溶胶 凝胶自燃烧法制备了纳米尺度的锌钴铁氧体Zn0 6 CoxFe2 4 -xO4 (x =0— 0 30 )粉体 ,分别在不同温度下进行了热处理 ,利用x射线衍射仪 (XRD)和振动样品磁强计 (VSM)对其物相结构和磁性进行了测量和分析 .实验结果表明 ,锌钴铁氧体Zn0 6 Co0 1 5Fe2 2 5O4 在 5 5 0— 80 0℃温度区间出现α Fe2 O3过渡相 ,在高于 80 0℃温度时生成单一尖晶石相锌钴铁氧体 ;随钴含量的增加 ,Zn0 6 CoxFe2 4 -xO4 的比饱和磁化强度先增后减 ,x =0 0 75— 0 1 5比饱和磁化强度较高 ;Zn0 6 CoxFe2 4 -xO4 在 1 30 0℃时x =0 0 75的矫顽力为 4 75 2 0A m ,x≥ 0 1 5时矫顽力在 1 2 0 0℃附近随温度缓慢上升 ,在 1 2 0 0— 1 30 0℃之间为平台状态 ,并且随钴含量的增加 ,矫顽力略有升高 .在x =0 1 0附近 ,可同时获得较高的比饱和磁化强度和较高的矫顽力
Nanocrystalline Zn0 6 CoxFe2 4 -xO4 (x = 0-030) powders were prepared by sol-gel self-combustion method. The powders were heat-treated at different temperatures and characterized by X-ray diffraction ) And the vibrating sample magnetometer (VSM) were used to measure and analyze the phase structure and magnetic properties of the samples.The experimental results show that Zn0 6 Co0 1 5Fe2 2 5O4 appears in the temperature range of 550 ~ 80 0 ℃ α Fe 2 O 3 transition phase. When the temperature is higher than 80 0 ℃, a single spinel Zn-Co ferrite is formed. The specific saturation magnetization of ZnO 6 CoxFe 2 4 -xO 4 increases first and then decreases with the increase of cobalt content, x = 0 0 75- 0 1 5 higher than the saturation magnetization; coercivity of Zn0 6 CoxFe2 4-xO4 at 1 30 0 ℃ x = 0 0 75 4 75 2 0A m, x ≥ 0 1 5 coercivity The force increases slowly with the temperature around 12000C and reaches a plateau between 1200-130O0C, and the coercivity slightly increases with the increase of cobalt content.When x = 0 10 Near, you can get higher than the saturation magnetization and high coercivity