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中文摘要：
以硝酸钡、硝酸铁和柠檬酸为原料，采用溶胶一凝胶法制备了单相钡铁氧体（BaFe12zO19）纳米粉体，并进一步研究了”（Fe）／n（Ba）、热处理温度对产物组成、形貌以及磁性能的影响。用X射线衍射仪（XRD）、扫描电子显微镜（SEM）和振动样品磁强计（VSM）分别对样品的组成、形貌和磁性能进行了表征。实验结果表明，当煅烧温度不变时，样品的晶粒尺寸随着n（Fe）／n（Ba）的增大而变大，磁性能随n（Fe）／n（Ba）的增大而增强；当n（Fe）／n（Ba）不变时，样品的晶粒尺寸随着煅烧温度的升高而变大。当n（Fe）／n（Ba）＝12时，在800℃煅烧2h得到单一晶型的钡铁氧体粉体。1000℃时样品的磁性能最佳，饱和磁化强度（^疋）为70．88A·m^2／kg，矫顽力（Hc）为372．89kA／m。
英文摘要：
A precursor was prepared by sol-gel method with Ba（NOa ）2, Fe（NOa ）3 . 9 H2O and C6 H8 O7.H2O as raw materials. Single-phase barium hexaferrite（BaFe12O19） nanoparticles were synthesized by calcining the precursor. And the influence of Fe/Ba molar ratio and calcination temperature on the crystal structure, morphology and magnetic properties were studied by X-ray diffraction（XRD）, scanning electron microscope（SEM） and vibrating sample magnetometer（VSM）. The experimental results show that the crystalline size and magnetic properties increase with the increasing of the Fe/Ba molar ratio when the calcination temperature is constant. On the other hand, the crystalline size grows with the increasing of the calcination temperature when Fe/Ba molar ratio is constant. Furthermore, when Fe/Ba molar ration is 12, the single-phase barium hexaferrite can be obtained after calcined at 800℃ for 2h. The barium hexaferrite sample calcined at 1000℃ exhibited the best magnetic properties： the saturation magneti- zation Ms=70. 88A .m^2/kg and Hc=372.89kA/m.
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