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首页> 外文期刊>Modern Physics Letters, B. Condensed Matter Physics, Statistical Physics, Applied Physics >Synthesis, microstructural and magnetic characterizations of self-assembled hematite nanoparticles
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Synthesis, microstructural and magnetic characterizations of self-assembled hematite nanoparticles

机译:自组装赤铁矿纳米粒子的合成,微观结构和磁性表征

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Phase pure hematite nanoparticles coated with octyl ether and oleic acid were synthesized by a facile chemical route. Nanoparticles in the size range 725 nm were obtained by annealing the as-prepared samples at different temperatures. Transmission electron micrographs revealed that the particles tend to organize themselves in chain-like structures consisting of three to six nanoparticles along a common axis. The reason behind this oriented attachment is traced to the exchange coupling between the nanoparticles. Effect of exchange coupling was also evidenced as suppression of superparamagnetism in lower dimension hematite nanoparticles. Morin transition was observed around 260 K by magnetization measurement for hematite nanoparticles having average crystallite size of 25 nm.
机译:通过简便的化学方法合成了包覆有辛醚和油酸的纯相赤铁矿纳米粒子。通过在不同温度下退火所制备的样品,获得了尺寸范围为725 nm的纳米颗粒。透射电子显微照片显示,这些粒子倾向于以沿着共同轴的三到六个纳米粒子组成的链状结构组织自己。这种定向的附着背后的原因可追溯到纳米颗粒之间的交换耦合。交换耦合的作用也被证明抑制了低维赤铁矿纳米粒子中的超顺磁性。对于平均晶粒尺寸为25nm的赤铁矿纳米颗粒,通过磁化测量在260K附近观察到莫林转变。

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