Abstract Nano-size Y-type hexaferrites powders are synthesized by using the sol–gel combustion method in nitrate urea systems. The X-ray diffraction patterns of Ca2Cu2Fe(12-x)AlxO22 annealed above 800 °C manifest that all the species have hexagonal crystal structure. TEM observation of as-burnt powders of Ca2Cu2Fe(12-x)AlxO22 shows the powder particles have an average particle size of 23 nm. Magnetic hysteresis loop measurements of the series Ca2Cu2Fe(12-x)AlxO22 exhibit that the saturation magnetization (Ms), the remanent magnetization (Mr) and the coercitivity (Hc) of compounds depend strongly on the chemical composition of materials. The maximum values of Ms (1.2898E-3 emu/g) and Mr (87.099E-3 emu/g) and the areas of magnetic hysteresis loop of compounds decrease with increasing the value of Al.

中文翻译：

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溶胶-凝胶燃烧法合成和表征纳米晶 Ca2Cu2Fe(12-x)AlxO22 Y 型六铁氧体

摘要 采用溶胶-凝胶燃烧法在硝酸尿素体系中合成了纳米尺寸的Y型六铁氧体粉末。Ca2Cu2Fe(12-x)AlxO22 在 800 °C 以上退火的 X 射线衍射图表明所有物种都具有六方晶体结构。Ca2Cu2Fe(12-x)AlxO22 烧成粉末的 TEM 观察表明粉末颗粒的平均粒径为 23 nm。Ca2Cu2Fe(12-x)AlxO22 系列的磁滞回线测量表明，化合物的饱和磁化强度 (Ms)、剩余磁化强度 (Mr) 和矫顽力 (Hc) 强烈依赖于材料的化学成分。Ms (1.2898E-3 emu/g)和Mr (87.099E-3 emu/g)的最大值和化合物的磁滞回线面积随着Al值的增加而减小。