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首页> 外文期刊>Physica, B. Condensed Matter >Synthesis of cobalt ferrite nanocrystallites by the forced hydrolysis method and investigation of their magnetic properties
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Synthesis of cobalt ferrite nanocrystallites by the forced hydrolysis method and investigation of their magnetic properties

机译：强制水解法合成钴铁氧体纳米微晶及其磁性

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Cobalt ferrite powder has been synthesized by the forced hydrolysis method in 1,2-propanediol. The particles, having a cubic spinel structure, are nanocrystallites with a mean diameter of 4 nm with almost equiaxial shapes and a narrow size distribution. These particles are superparamagnetic at room temperature and ferrimagnetic at temperatures below the blocking temperature of about 180 K. A remarkable shift of the blocking temperature with frequency was observed in the AC susceptibility measurements. The calculated value of anisotropy constant at 0 K, K-A (0) = 5.36 x 10(7) erg/cm(3), is higher than that in the bulk material. The saturation magnetization and the coercivity measured at 5 K are 75 emu/g and 10.3 kOe, respectively. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 8]
机译：铁氧体钴粉末已经通过强制水解法在1,2-丙二醇中合成。具有立方尖晶石结构的颗粒是平均直径为4nm的纳米晶体，具有几乎等轴的形状和窄的尺寸分布。这些颗粒在室温下是超顺磁性的，在低于约180 K的阻断温度的温度下是亚铁磁性的。在AC磁化率测量中观察到阻断温度随频率的显着变化。各向异性常数的计算值为0 K，K-A（0）= 5.36 x 10（7）erg / cm（3），高于散装材料。在5 K下测得的饱和磁化强度和矫顽力分别为75 emu / g和10.3 kOe。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：8]

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