Effect of Dy3+ ions substitution on structural, electrical, and dielectric properties of SrDyxFe12-xO19 hexaferrite prepared by sol-gel combustion method

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2023-07-03 DOI:10.1007/s10832-023-00320-2

Jayashri Mahapatro, Sher Singh Meena, Sadhana Agrawal

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Abstract

The substitution of Dy³⁺ ions in the M-type hexaferrite structure has been successfully synthesized by sol-gel combustion method according to the formula SrDy_xFe_12-xO₁₉ (x = 0.0, 0.08, 0.16, 0.24, 0.32, and 0.40). The XRD analysis confirmed the formation of single-phase M-type hexagonal structures up to x = 0.24 compositions. The average crystallite size for the SrDy_xFe_12-xO₁₉ samples ranges from 90.64 to 290.04 nm, whereas the value of the lattice parameters 'a' and 'c' vary from 5.8590 - 5.8879 Å and 22.9675 - 23.0761 Å, respectively. Scanning electron microscopy (SEM) was used for morphological analysis. Due to ceasing effect of polarization, the dielectric constant decreases in the higher frequencies. The SrDy_xFe_12-xO₁₉ hexaferrites exhibit non-Debye type dielectric relaxation behavior confirmed by complex impedance spectroscopy (CIS) investigation. The SrDy_xFe_12-xO₁₉ samples can be utilized as a promising material for various device applications due to a decrease in dielectric loss and an increase in dielectric constant with increasing Dy³⁺ ions concentration.

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Dy3+离子取代对溶胶-凝胶燃烧法制备SrDyxFe12-xO19六铁氧体结构、电学和介电性能的影响

根据 SrDyxFe12-xO19 公式（x = 0.0、0.08、0.16、0.24、0.32 和 0.40），通过溶胶-凝胶燃烧法成功合成了取代 Dy3+ 离子的 M 型六方铁氧体结构。XRD 分析证实，在 x = 0.24 的成分范围内，形成了单相 M 型六方结构。SrDyxFe12-xO19 样品的平均晶粒大小在 90.64 到 290.04 nm 之间，而晶格参数 "a "和 "c "的值分别在 5.8590 - 5.8879 Å 和 22.9675 - 23.0761 Å 之间。扫描电子显微镜（SEM）用于形态分析。由于极化效应的停止，介电常数在较高频率下会降低。复阻抗光谱（CIS）研究证实，SrDyxFe12-xO19 六铁氧体表现出非德拜型介电弛豫行为。随着 Dy3+ 离子浓度的增加，介电损耗降低，介电常数增加，因此 SrDyxFe12-xO19 样品可作为一种有前途的材料用于各种器件应用。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.