新型 Mg3Ga2TiO8 陶瓷的微波介电性能

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

Ceramics International Pub Date : 2024-09-30 DOI:10.1016/j.ceramint.2024.09.422

Linzhao Ma, Qianbiao Du, Guo Tian, Hongzhi Xiao, Longxiang Jiang, Hao Li

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引用次数: 0

摘要

采用固相法制备了 Mg3Ga2TiO8 陶瓷。在 1440 °C 下烧结的陶瓷具有优异的微波介电性能（εr = 12.07、Q × f = 89,270 GHz 和 τf = -40.7 ppm/°C）。Mg3Ga2TiO8 陶瓷的典型尖晶石结构通过里特维尔德精炼和拉曼光谱得到了证实。高分辨率透射电子显微镜显示 Mg3Ga2TiO8 陶瓷存在局部晶格畸变，维氏硬度为 12.53 GPa。Mg3Ga2TiO8 陶瓷的 εr 值和 Q × f 值受到相对密度的影响。根据 C-M 方程得到的理论 εr 低于测量值 εr，这可能是由于低估了 Ti 离子的极化性。根据 P-V-L 理论，Ti2-O1 的 fi 值最高，对 εr 的贡献率为 29.92%。Ga2-O1 键对 U 的贡献率为 35.76%，对 Q × f 的影响最大。

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Microwave dielectric properties of novel Mg3Ga2TiO8 ceramic

Mg₃Ga₂TiO₈ ceramics were prepared using a solid-phase method. The ceramics sintered at 1440 °C exhibited excellent microwave dielectric properties (ε_r = 12.07, Q × f = 89,270 GHz, and τ_f = −40.7 ppm/°C). The typical spinel structure of the Mg₃Ga₂TiO₈ ceramic was confirmed through Rietveld refinement and Raman spectroscopy. High-resolution transmission electron microscopy indicated local lattice distortion in the Mg₃Ga₂TiO₈ ceramics, with a Vickers hardness of 12.53 GPa. The values of ε_r and Q × f for the Mg₃Ga₂TiO₈ ceramics were affected by the relative density. The theoretical ε_r obtained from the C-M equation was lower than the measured ε_r, plausibly due to underestimation of the polarizability of the Ti ions. According to the P-V-L theory, Ti2-O1 has the highest f_i value, contributing 29.92 % to ε_r. The contribution rate of the Ga2-O1 bond to U was 35.76 %, with the greatest impact on Q × f.

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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.