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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Multiferroic properties of Bi0.8Dy0.2-xLaxFeO3 nanoparticles
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Multiferroic properties of Bi0.8Dy0.2-xLaxFeO3 nanoparticles

机译：Bi0.8Dy0.2-xLaxFeO3纳米粒子的多铁性

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摘要

Bi(0.8)Dy(0.2-x)LaxFeO(3) (BDLFOx) (x = 0, 0.10 and 0.20 respectively) nanoparticles were prepared by the ethylene glycol based sol-gel method. The influence of the average radius and the effective magnetic moment of Bi-site ion on the structure, magnetic and dielectric properties, and the effective magnetic susceptibility of BDLFO x nanoparticles was investigated. All the samples were indexed to the orthorhombic structure based on the results of x-ray diffraction. The grain size of the samples increased with the increase in Bi-site ionic average radius. The magnetization of the samples was found to decrease with the effective magnetic moment of Bi-site ion decreasing. The dielectric constant and loss were improved when the Bi-site ionic average radius decreased and the effective magnetic moment of the Bi-site ions increased. The enhanced magnetization M and the polarization P in nanoparticles made the effective magnetic susceptibility of the samples greatly enhanced, in particular for the sample of x = 0. Therefore we concluded that the small amount of substitution of Bi3+ ions by trivalent rare-earth ions with a smaller ionic radius than Bi3+ ion and a high magnetic moment in the nano-system was a way to improve the multiferroic properties of BiFeO3.
机译：通过基于乙二醇的溶胶-凝胶法制备了Bi（0.8）Dy（0.2-x）LaxFeO（3）（BDLFOx）（分别为x = 0、0.10和0.20）纳米粒子。研究了Bi-位离子的平均半径和有效磁矩对BDLFO x纳米粒子的结构，磁性和介电性能以及有效磁化率的影响。基于x射线衍射的结果，所有样品都被索引为正交结构。样品的晶粒尺寸随双位离子平均半径的增加而增加。发现样品的磁化强度随Bi-位离子的有效磁矩的降低而降低。当Bi位离子平均半径减小而Bi位离子的有效磁矩增加时，介电常数和损耗得到改善。纳米粒子中增强的磁化强度M和极化强度P使样品的有效磁化率大大提高，特别是对于x = 0的样品。因此，我们得出结论：少量的Bi3 +离子被三价稀土离子取代比Bi3 +离子更小的离子半径和纳米系统中的高磁矩是一种改善BiFeO3的多铁性的方法。

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