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首页> 外文会议>International Symposium on Advanced Materials >Correlation of Microstructures with Electrical Transport Properties in Mn Doped Co Nanoferrite Particles
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Correlation of Microstructures with Electrical Transport Properties in Mn Doped Co Nanoferrite Particles

机译：Mn掺杂CO纳米铁矿颗粒中电容性能的微观结构的相关性

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Magnetic nanocomposites are offering a variety of novel features and tune able properties, mainly depending on particle size, cation distribution, morphology and porosity of the prepared materials. The aim of this research work is to understand the effects of Mn doping on the microstructures and hence consequences on the electrical transport properties with shift of cation distribution in CoFe_2O_4. Co_(1-x)Mn_xFe_2O_4 nanocrystallite particles with stoichiometric proportion (x) varying from 0.0 to 1.0 were prepared by co-precipitation method. X-ray diffraction patterns confirmed the FCC spinel structure of synthesized particles. The crystal structure is found to be inverse cubic spinel with a space group Fd3m and the lattice constants ranges from 8.36 A to 8.46 A The crystallite sizes were calculated from the most intense peak (311) using the Debye-Scherrer formula for all the samples those were synthesized at reaction temperature of 70°C. Then samples were sintered at 600°C for 3 hours, characterized by X-ray diffraction at room temperature and DC electrical resistivity measurements were done as a function of temperature by two-probe method from 370 K to 690 K. The measurements showed that DC electrical resistivity decreased with increase in temperature ensuring the semiconductor nature of the material in this temperature range. DC electrical resistivity results were discussed in terms of polaron hopping model under the effects of cation distribution. AC electrical properties were also analyzed. All the observed properties were correlated with observed microstructures.
机译：磁性纳米复合材料提供各种新颖特征和调谐能力，主要取决于制备材料的粒度，阳离子分布，形态和孔隙率。该研究的目的是了解Mn掺杂对微观结构的影响，因此在CoFe_2O_4中阳离子分布变化的电气传输性能的影响。通过共沉淀法制备具有0.0至1.0的化学计量比例（X）的CO_（1-X）MN_FE_2O_4纳米晶体颗粒。 X射线衍射图案证实了合成颗粒的FCC尖晶石结构。发现晶体结构是具有空间组FD3M的逆立方尖晶石，并且晶格常数从8.36A到8.46的范围，使用德比·Scherrer公式计算所有样品的最强烈的峰值（311）计算晶状体尺寸在70℃的反应温度下合成。然后将样品在600℃下烧结3小时，其特征在于室温下的X射线衍射，并且通过从370k至690 K的双探针方法作为温度的函数进行DC电阻率测量。测量结果显示了DC电阻率随着温度的增加而降低，确保该温度范围内的材料的半导体性质。在阳离子分布的影响下，在Polaron跳跃模型方面讨论了直流电阻率结果。还分析了AC电性能。所有观察到的性质与观察到的微观结构相关。

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