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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Structural and dielectric properties of Cr-doped Ni-Zn nanoferrites
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Structural and dielectric properties of Cr-doped Ni-Zn nanoferrites

机译：Cr掺杂Ni-Zn纳米铁氧体的结构和介电性能

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摘要

Cr-doped Ni-Zn ferrite nanoparticles having the general formula Ni _(0.5)Zn_(0.5)Cr_xFe_(2-x)O_4 (x = 0.1, 0.3, 0.5) were prepared by the simplified sol-gel method. The structural and dielectric properties of the samples sintered at 750±5 °C were studied. X-ray diffraction (XRD) patterns confirm the single-phase spinel structure of the prepared samples. The crystallite size calculated from the most intense peak (3 1 1) using the Debye-Scherrer formula was 29-34 nm. Scanning electron microscope images showed that the particle size of the samples lies in the nanometer regime. The dielectric constant (ε_r), dielectric loss tangent (tan δ) and ac electrical conductivity (σ_(ac)) of nanocrystalline Cr-Ni-Zn ferrites were investigated as a function of frequency and Cr concentration. The dependence of ε_r, tan δ and σ_(ac) on the frequency of alternating applied electric field is in accordance with the Maxwell-Wagner model. The effect of Cr doping on the dielectric and electric properties was explained on the basis of cations distribution in the crystal structure.
机译：通过简化的溶胶-凝胶法制备了通式为Ni_（0.5）Zn_（0.5）Cr_xFe_（2-x）O_4（x = 0.1，0.3，0.5）的Cr掺杂Ni-Zn铁氧体纳米颗粒。研究了在750±5°C下烧结的样品的结构和介电性能。 X射线衍射（XRD）模式证实了所制备样品的单相尖晶石结构。使用Debye-Scherrer公式从最强峰（3 1 1）计算出的微晶尺寸为29-34 nm。扫描电子显微镜图像显示样品的粒度在纳米范围内。研究了纳米晶Cr-Ni-Zn铁氧体的介电常数（ε_r），介电损耗角正切（tanδ）和交流电导率（σ_（ac））与频率和Cr浓度的关系。 ε_r，tanδ和σ_（ac）对交变电场频率的依赖性符合Maxwell-Wagner模型。根据晶体结构中阳离子的分布，解释了Cr掺杂对介电和电性能的影响。

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