Structural and temperature dependent dielectric behaviour of BxFe(3−x)O4 nanoferrite particles

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Micro & Nano Letters Pub Date : 2024-03-31 DOI:10.1049/mna2.12194

Paramesh Donta

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Abstract

The auto-combustion technique was employed to synthesize nano particles of B_xFe₍₃₋_x₎O₄ (x = 0.0, 0.7, 1.18, 1.36 and 1.54). The resulting structural and dielectric properties of the boron doped Fe₃O₄ were evaluated. XRD analysis confirmed the presence of a single spinel structure with crystallite dimensions ranging from 21.18 to 26.43 nm and lattice parameters of 8.211 to 8.487 Ǻ. The morphological images revealed homogenous and spherical grain sizes, while EDX confirmed the presence of constituent elements used. The X-ray density increased whereas the bulk density and the porosity decreased with boron substitution. The study of dielectric properties and AC conductivity (σ_AC) was demonstrated and the AC conductivity decreased with increasing boron concentration, indicating a hopping mechanism. Moreover, noticeable variations in dielectric loss, AC conductivity, and dielectric permittivity with temperature and frequency were observed. These observations were attributed to the Maxwell–Wagner interfacial polarization and the hopping of charges between Fe³⁺ and Fe²⁺ ions.

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BxFe(3-x)O4 纳米铁氧体颗粒的结构和随温度变化的介电性能

采用自燃技术合成了 BxFe(3-x)O4 纳米颗粒（x = 0.0、0.7、1.18、1.36 和 1.54）。对掺硼 Fe3O4 的结构和介电性质进行了评估。XRD 分析证实了单一尖晶石结构的存在，晶粒尺寸为 21.18 至 26.43 nm，晶格参数为 8.211 至 8.487 Ǻ。形态图像显示出均匀的球形晶粒尺寸，而电离辐射X则证实了所使用的组成元素的存在。X 射线密度随着硼的替代而增加，而体积密度和孔隙率则随着硼的替代而降低。对介电性质和交流电导率（σAC）的研究表明，交流电导率随着硼浓度的增加而降低，这表明存在跳变机制。此外，还观察到介电损耗、交流电导率和介电常数随温度和频率的显著变化。这些观察结果归因于 Maxwell-Wagner 界面极化以及 Fe3+ 和 Fe2+ 离子之间的电荷跳跃。

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来源期刊

Micro & Nano Letters 工程技术-材料科学：综合

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

2.8 months

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