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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Tailoring the magnetic properties and magnetorheological behavior of spinel nanocrystalline cobalt ferrite by varying annealing temperature
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Tailoring the magnetic properties and magnetorheological behavior of spinel nanocrystalline cobalt ferrite by varying annealing temperature

机译：通过改变退火温度调整尖晶石纳米晶钴铁氧体的磁性能和磁流变行为

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摘要

Magnetic nanoparticles of spinel nanocrystalline cobalt ferrite were synthesized via the sol-gel method and subsequent annealing. The influence of the annealing temperature on the structure, magnetic properties, and magnetorheological effect was investigated. The finite crystallite size of the particles, determined by X-ray diffraction and the particle size observed via transmission electron microscopy, increased with the annealing temperature. The magnetic properties observed via a vibrating sample magnetometer showed that an increase in the annealing temperature leads to the increase in the magnetization saturation and, in contrast, a decrease in the coercivity. The effect of annealing on the magnetic properties of ferrite particles has been explained by the recrystallization process at high temperatures. This resulted in grain size growth and a decrease in an imposed stress relating to defects in the crystal lattice structure of the nanoparticles. The magnetorheological characteristics of suspensions of ferrite particles in silicone oil were measured using a rotational rheometer equipped with a magnetic field generator in both steady shear and small-strain oscillatory regimes. The magnetorheological performance expressed as a relative increase in the magnetoviscosity appeared to be significantly higher for suspensions of particles annealed at 1000 °C.
机译：尖晶石纳米晶钴铁氧体的磁性纳米粒子通过溶胶-凝胶法和随后的退火合成。研究了退火温度对结构，磁性能和磁流变效应的影响。通过X射线衍射确定的颗粒的有限微晶尺寸和通过透射电子显微镜观察到的颗粒尺寸随退火温度增加。通过振动样品磁力计观察到的磁性能表明，退火温度的升高导致磁化饱和度的提高，而矫顽力的降低。退火对铁氧体颗粒磁性能的影响已经通过高温下的重结晶过程得到了解释。这导致晶粒尺寸增长和与纳米颗粒的晶格结构中的缺陷有关的施加应力的减小。使用配备有磁场发生器的旋转流变仪，在稳态剪切和小应变振荡状态下，测量了硅油中铁氧体颗粒悬浮液的磁流变特性。对于在1000°C退火的颗粒悬浮液，表示为磁粘性相对增加的磁流变性能似乎要高得多。

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