Nanocrystalline platelets of Sr hexaferrite, SrFe 12 O 19 , were prepared by four techniques (two hydrothermal and two sol–gel techniques) and calcined at 1000 °C for 1, 2, 4, 8 and 16 h. The microstructure of these samples was analyzed using Rietveld refinements of high-resolution synchrotron powder x-ray diffraction data, and the obtained results were correlated with the magnetic properties obtained from vibrating sample magnetometer measurements. The calcination treatment causes the crystallites to preferentially grow along the c -axis, leading to more isotropic crystallites. Moreover, the microstructural changes induced by calcination alter the magnetic properties, yielding a higher saturation magnetization in all samples. The attained coercivity is correlated with the crystallite size along the width of the platelets. Despite the pronounced changes of the microstructure and the magnetic properties after calcination, the calcination duration has a min...

中文翻译：

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通过合成路线和煅烧时间控制SrFe 12 O 19纳米片的结构和磁性

用四种技术（两种水热法和两种溶胶-凝胶技术）制备了六价铁锶纳米晶片SrFe 12 O 19，并在1000°C下煅烧了1，2，4，8和16 h。使用高分辨率的同步加速器粉末X射线衍射数据的Rietveld改进对这些样品的微观结构进行了分析，并将所得结果与通过振动样品磁力计测量获得的磁性能相关。煅烧处理导致微晶优先沿c轴生长，从而导致更多的各向同性微晶。而且，由煅烧引起的微观结构变化会改变磁性，从而在所有样品中产生更高的饱和磁化强度。所获得的矫顽力与沿血小板宽度的微晶尺寸相关。