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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural, magnetic and electrical properties of nanocrystalline zinc ferrite
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Structural, magnetic and electrical properties of nanocrystalline zinc ferrite

机译：纳米晶铁氧体锌的结构，磁和电性能

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摘要

Nanoparticles of ZnFe_2O_4 with grain size of 30 nm have been synthesized via sol-gel auto combustion method and characterized using DSC (differential scanning calorimetry), XRD (X-ray diffraction), SEM (scanning electron microscopy), EDAX (energy dispersive X-ray analysis), FTIR (Fourier transform infrared spectroscopy), VSM (vibrating sample magnetometer) and Ac-electrical conductivity measurement setup. Structural analysis using XRD and FTIR show the formation of spinel structure in nano ZnFe_2O_4 particles. The cation distribution in the sample has been estimated theoretically and the results show that as-prepared nanoparticles of ZnFe_2O_4 have partially inverted ionic distribution in comparison with that of bulk zinc ferrite. Results from EDAX indicate the ratio of Fe:Zn as close to 2:1. The presence of a weak ferrimagnetic phase for nano ZnFe_2O_4 at room temperature has been established from its hysteresis behavior. Redistribution of cations occurring at nano-regime and surface spin canting of nanoparticles of ZnFe_2O_4 are expected to be responsible for the presence of magnetic ordering in nano ZnFe_2O_4. The Curie temperature of nano ZnFe_2O_4 determined from magnetization versus temperature measurement is equal to 375°C. The electrical conductivity of the present ZnFe_2O_4 at a frequency of 100 kHz at room temperature is observed to be 2.11 x 10~(-8) Ω~(-1) cm~(-1) which is four orders lesser in magnitude than the value of bulk ZnFe_2O_4. Overall conductivity response with respect to temperature and frequency confirm that ZnFe_2O_4 tends to become more dielectric in the nano-regime.
机译：通过溶胶-凝胶自动燃烧法合成了粒径为30 nm的ZnFe_2O_4纳米颗粒，并利用DSC（差示扫描量热法），XRD（X射线衍射），SEM（扫描电子显微镜），EDAX（能量色散X-射线分析），FTIR（傅里叶变换红外光谱），VSM（振动样品磁力计）和交流电导率测量设置。用XRD和FTIR进行结构分析表明，在纳米ZnFe_2O_4颗粒中尖晶石结构的形成。从理论上估计了样品中的阳离子分布，结果表明，与块状铁氧体相比，制备的ZnFe_2O_4纳米颗粒具有部分倒置的离子分布。 EDAX的结果表明Fe：Zn的比例接近2：1。从其磁滞行为可以确定在室温下纳米ZnFe_2O_4的弱铁磁相的存在。预期在纳米区域发生的阳离子的重新分布和ZnFe_2O_4纳米颗粒的表面自旋倾斜是造成纳米ZnFe_2O_4磁性排序的原因。由磁化对温度测量确定的纳米ZnFe_2O_4的居里温度等于375°C。在室温下，当前ZnFe_2O_4在100 kHz频率下的电导率为2.11 x 10〜（-8）Ω〜（-1）cm〜（-1），比该值小四个数量级。 ZnFe_2O_4块。关于温度和频率的总体电导率响应证实，ZnFe_2O_4倾向于在纳米区域变得更具介电性。

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