中文摘要：

对水热法制备的BaFe12O19纳米颗粒进行了不同温度的热处理,研究热处理温度对纳米钡铁氧体微结构和磁性能的影响。结果表明,随着热处理温度的提升,铁氧体样品粒径逐渐增大,结晶性能趋于完善;水热合成的钡铁氧体纳米颗粒室温测得的矫顽力为92.21Oe,饱和磁化强度为8.87emu/g,呈现为半硬磁特性;同时,样品的磁性能与热处理温度有密切关系,在800℃处理的纳米钡铁氧体室温饱和磁化强度Ms增加到52.97emu/g,矫顽力Hc增加到5.052kOe,居里温度大小为712.2K,样品转变为硬磁体,转变温度区间定为500~700℃。

英文摘要：

The influence of temperature on microstructure and magnetic properties of BaFe12O19 nanoparticles synthesized by hydrothermal method were studied. The results show that the higher temperatures result in bigger mean crystallite size and better degree of crystallinity of BaFe12O19 nanoparticles. The coercivity and saturation magnetization of single-phase Ba Fe12O19 synthesized are 92.21 Oe and 8. 87 emu / g in room temperature,which is mid-hard magnetic characteristic. The magnetic properties of the samples depend on the temperatures of heat treatment. After heat treatment at 800 ℃,the coercivity and saturation magnetization of Ba Fe12O19 increases to 5. 052 k Oe and 52. 97 emu / g,and the Curie temperature（ Tc） is 712. 2 K. It is found that the temperature interval 500-700 ℃ of heat treatment determines that the barium ferrite exhibits a mid-hard magnetic characteristic into the hard one.