Structural, optical and magnetic properties of polyol-mediated synthesized Al-substituted Ca-Sr hexaferrites for data storage and microwave absorption applications

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.184

Anuja Dhingra , O.P. Thakur , Raghvendra Pandey

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Abstract

This manuscript presents an investigation of aluminium-substituted calcium strontium M-type hexaferrites with a chemical formula of Ca_0.5Sr_0.5Fe_12–xAl_xO₁₉ (x = 0.0–2.0) synthesised using modified polyol-mediated route for data storage and microwave absorption applications. Structural analysis via X-ray diffraction, field-emission scanning electron microscopy, elemental dispersive X-ray analysis, Fourier transform infrared spectroscopy, and Raman spectroscopy reveals the successful formation of the M-type hexaferrite phase with well-defined crystal structures of space group P6₃/mmc. The magnetic measurements demonstrated a significant enhancement in the coercivity value from 0.50 kOe to 7.6 kOe for the highest Al-doped (x = 2.0) composition of Ca-Sr hexaferrites, following the trend as doping concentration increases, coercivity also increases, and saturation magnetization decreases. The highest Al-substituted hexaferrite also demonstrated high squareness ratio (0.59), improved maximum energy product (3.76 MGOe), and enhanced magnetocrystalline anisotropy (9.50 × 10⁵ erg/cm³). The switching field distribution curves indicated high switching field in Al-substituted strontium hexaferrites with improved magnetic ordering and stability, suggesting their potential for high-performance magnetic devices. The microwave absorption study revealed a maximum reflection loss of −27 dB at 9.13 GHz with 2 mm thickness for x = 0.5 concentration. Optical characterization using UV–Vis spectroscopy and current-voltage (I-V) characteristics reveals altered band gap and conductivity reflecting changes in electronic structure.

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多元醇介导合成al取代Ca-Sr六铁氧体的结构、光学和磁性能

本文研究了一种化学分子式为Ca0.5Sr0.5Fe12-xAlxO19 （x = 0.0-2.0）的铝取代钙锶m型六铁氧体，该六铁氧体采用改性多元醇介导途径合成，用于数据存储和微波吸收。通过x射线衍射、场发射扫描电镜、元素色散x射线分析、傅里叶变换红外光谱和拉曼光谱等手段对其结构进行分析，发现空间群P63/mmc的m型六铁素体相成功形成，晶体结构明确。磁性测量结果表明，当掺al最高（x = 2.0）时，Ca-Sr六铁氧体的矫顽力值从0.50 kOe显著提高到7.6 kOe，并且随着掺杂浓度的增加，矫顽力也增加，饱和磁化强度降低。最高的al取代六铁素体也表现出较高的方形比（0.59），提高了最大能积（3.76 MGOe），增强了磁晶各向异性（9.50 × 105 erg/cm3）。开关场分布曲线表明，铝取代锶六铁氧体具有较高的开关场，且磁性有序性和稳定性有所提高，表明其在高性能磁性器件中的应用潜力。微波吸收研究表明，当x = 0.5浓度时，在9.13 GHz处，厚度为2mm时，最大反射损失为- 27 dB。利用紫外可见光谱和电流-电压（I-V）特性进行光学表征，揭示了带隙和电导率的变化，反映了电子结构的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.