改善Ba0.85La0.15Fe12-xCoxO19六铁氧体的磁和ku波段微波响应

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

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2025.01.050

Santhoshkumar Mahadevan , Anupriya Choudhary , Puneet Sharma , Juliano C. Denardin , Bhupendra Chudasama , Mangalaraja Ramalinga Viswanathan , Juan F. Vivanco

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引用次数: 0

摘要

采用固态陶瓷法制备了镧钴取代六铁体钡Ba0.85La0.15Fe12-xCoxO19。研究了杂价取代对提高磁性和Ku波段（12.4 ~ 18 GHz）微波性能的影响。x射线衍射、傅里叶变换红外光谱和拉曼光谱证实了晶体体系中存在磁铅石相和有效取代的异价离子。显微结构分析显示，替代样品具有高密度、发育良好的六方晶粒。磁测量结果表明，在La-Co取代下，磁饱和度从58 emu/g增加到62 emu/g，矫顽力从1.3 kOe增加到1.9 kOe，而各向异性根据接近饱和规律计算，呈现出逐渐降低的趋势。La-Co取代提高了介质介电常数和磁导率，从而增强了吸收器在ku波段频率范围内的阻抗匹配。微波吸收研究表明，替代样品的有效吸收带宽（EAB）超过1 GHz。对于厚度为1.4 mm的Ba0.85La0.15Fe11.9Co0.1O19样品，最大EAB为3.01 GHz，而在13.30 GHz下，1.6 mm的反射损耗最小为- 21.88 dB（吸收>； 99.9%）。研究结果对Ku波段的微波器件具有广阔的应用前景。

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Improved magnetic and ku-band microwave response in Ba0.85La0.15Fe12-xCoxO19 hexaferrites

Lanthanum and cobalt substituted barium hexaferrite, Ba_0.85La_0.15Fe_12-xCo_xO₁₉, was prepared by the solid-state ceramic method. The effect of heterovalent substitution on the improved magnetic and K_u band (12.4–18 GHz) microwave performance was studied. X-ray diffraction, Fourier transform infrared and Raman spectroscopy confirmed the presence of magnetoplumbite phase and effective substitution of heterovalent ions in the crystal system. Microstructural analysis revealed highly dense, well developed hexagonal grains for substituted samples. Magnetic measurements showed an increase in magnetic saturation from 58 to 62 emu/g and coercivity from 1.3 to 1.9 kOe with La-Co substitution, while anisotropy, calculated from the law of approaching saturation, exhibited a gradual decrease. Dielectric permittivity and permeability were improved with La-Co substitution, leading to enhanced impedance matching in the absorber at the K_u-band frequency range. Microwave absorption studies revealed a broad effective absorption bandwidth (EAB) exceeding 1 GHz for substituted samples. The maximum EAB of 3.01 GHz was observed for Ba_0.85La_0.15Fe_11.9Co_0.1O₁₉ sample with a 1.4 mm thickness, while the reflection loss minimum of −21.88 dB (absorption >99.9 %) was noted for 1.6 mm at 13.30 GHz. The observed results were promising for the microwave devices in K_u band frequency.

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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.