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- W1128878412 abstract "用均匀共沉淀法制备了钛酸钡-钡铁氧体核-壳粒子,研究了沉淀反应温度、尿素/金属离子摩尔比值（R）和BaTiO3浓度对核-壳粒子形貌和结构的影响,探讨了钛酸钡-钡铁氧体核-壳粒子在焙烧时的形成过程及其磁性能.采用透射电子显微镜（TEM）、X射线衍射（XRD）分析仪对钛酸钡-钡铁氧体前驱物核-壳粒子及钛酸钡-钡铁氧体核-壳粒子的形貌和结构进行了表征,采用振动样品磁强计（VSM）研究了钛酸钡-钡铁氧体核-壳粒子的磁性能.结果表明：当沉淀反应温度为100°C,R为180,BaTiO3浓度为2.5g·L-1时,金属离子沉淀完全,得到的钛酸钡-钡铁氧体前驱物核-壳粒子包覆层均匀、完整、光滑,厚度约为10nm.过高的温度和R值都会导致大量独立颗粒杂质的生成;随着BaTiO3浓度的增大,包覆层厚度有减小的趋势.当焙烧温度为900°C时,壳层中开始形成BaFe12O19相,其形成过程为晶态的α-Fe2O3和BaCO3首先生成中间相BaFe2O4,然后由BaFe2O4和α-Fe2O3反应得到最终的BaFe12O19.当焙烧温度为1000°C时,壳层完全转化为BaFe12O19相.随着焙烧温度从900°C升高到1000°C,所得BaTiO3-BaFe12O19核-壳粒子的饱和磁化强度从16.5A·m2·kg-1增加到39.5A·m2·kg-1,矫顽力从340kA·m-1略微降低到316kA·m-1." @default.
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- W1128878412 date "2011-01-01" @default.
- W1128878412 modified "2023-10-16" @default.
- W1128878412 title "Preparation of BaTiO<sub>3</sub>-BaFe<sub>12</sub>O<sub>19</sub> Core-Shell Structure Particles by Homogeneous Coprecipitation" @default.
- W1128878412 doi "https://doi.org/10.3866/pku.whxb20110423" @default.
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