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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Physical properties of Co(Mn)Fe_2O_4 nanomaterials
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Physical properties of Co(Mn)Fe_2O_4 nanomaterials

机译：Co（Mn）Fe_2O_4纳米材料的物理性质

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摘要

CoFe_2O_4 and MnFe_2O_4 ferrite nanoparticles were prepared by the co-precipitation method. The structural evolutions of the nanophase have been studied. The refinement result showed that the type of cationic distribution over the tetrahedral and octahedral sites in the nanocrystalline lattice is a partially inverse spinel. The morphology of the samples has been determined using transmission electron microscopy and the magnetic properties of the samples are given. The gap energy is calculated using the Korringa-Kohn-Rostoker method combined with a coherent potential approximation and using optical measurements for CoFe_2O_4 and MnFe_2O_4. This study has been extended theoretically to the mixed spinel ferrites, FeCoMn_xFe_(1-x)O_4. Indeed, the saturation magnetization, the critical temperature, exchange interactions and Curie constant for the cation distribution, have been calculated. The high temperature series expansion combined with the Padé approximant are used to determine the critical temperature and critical exponent (γ) associated with the magnetic susceptibility of mixed spinels.
机译：采用共沉淀法制备了CoFe_2O_4和MnFe_2O_4铁氧体纳米粒子。研究了纳米相的结构演变。细化结果表明，在纳米晶格的四面体和八面体位点上的阳离子分布类型是部分反尖晶石。已经使用透射电子显微镜确定了样品的形态，并给出了样品的磁性。使用Korringa-Kohn-Rostoker方法结合相干势近似并使用CoFe_2O_4和MnFe_2O_4的光学测量来计算间隙能量。该研究已从理论上扩展到混合尖晶石铁氧体FeCoMn_xFe_（1-x）O_4。实际上，已经计算了阳离子分布的饱和磁化强度，临界温度，交换相互作用和居里常数。高温序列膨胀与Padé近似值结合在一起可用于确定与混合尖晶石的磁化率相关的临界温度和临界指数（γ）。

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