Study on the microwave dielectric properties of 0.84MgNb2-x(Ti1/2W1/2)xO6-0.16CaTiO3 ceramic

IF 2.8 4区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Materials Science: Materials in Electronics Pub Date : 2024-11-13 DOI:10.1007/s10854-024-13813-9

Yueming Li, Jiajun Huang, Binxuan Jiang, Yi Sun, Kai Li, Zongyang Shen, Zhumei Wang, Huanhuan Guo

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Abstract

In order to meet the demand of high-quality microwave dielectric ceramics for the development of wireless communication, 0.84MgNb_2-x(Ti_1/2W_1/2)_xO₆-0.16CaTiO₃(x = 0, 0.03, 0.05, 0.07, 0.09, 0.11) microwave dielectric ceramics were prepared by solid-phase method. The effects of phase structure, sintering properties, microstructure, and microwave dielectric properties of 0.84MgNb₂O₆-0.16CaTiO₃ ceramics in which the Nb⁵⁺ ionic substituted with different contents of (Ti_1/2W_1/2)⁵⁺ were studied. The results indicate that the partial Nb⁵⁺ in the 0.84MgNb_2-x(Ti_1/2W_1/2)_xO₆-0.16CaTiO₃ nominal composition are replaced by the complex cations (Ti_1/2W_1/2)⁵⁺ in the crystal structure, and no new phase is produced. With the gradual increase of (Ti_1/2W_1/2)⁵⁺ addition, the bulk density of 0.84MgNb_2-x(Ti_1/2W_1/2)_xO₆-0.16CaTiO₃ ceramics increased, the sintering temperature did not significantly change, the ceramic cell volume decreased, and the material polarizability and filling rate decreased, resulting in a decrease in the ceramics’ dielectric constant ε_r, the quality factor Q × f increases, and the frequency temperature coefficient τ_f shifts to a positive value. The 0.84MgNb_1.95(Ti_1/2W_1/2)_0.05O₆-0.16CaTiO₃ ceramic with x = 0.05 composition sintered at 1250 °C for 4 h holding time has the best microwave dielectric properties: ε_r = 21.52, Q × f = 96983 GHz, and τ_f = − 3.8 × 10^–6/ °C.

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0.84MgNb2-x(Ti1/2W1/2)xO6-0.16CaTiO3 陶瓷的微波介电性能研究

为了满足无线通信发展对高质量微波介质陶瓷的需求，采用固相法制备了 0.84MgNb2-x(Ti1/2W1/2)xO6-0.16CaTiO3(x = 0, 0.03, 0.05, 0.07, 0.09, 0.11) 微波介质陶瓷。研究了 Nb5+离子取代不同含量 (Ti1/2W1/2)5+ 的 0.84MgNb2O6-0.16CaTiO3 陶瓷的相结构、烧结性能、微观结构和微波介电性能的影响。结果表明，0.84MgNb2-x(Ti1/2W1/2)xO6-0.16CaTiO3 标称成分中的部分 Nb5+在晶体结构中被复合阳离子 (Ti1/2W1/2)5+ 所取代，没有产生新相。随着 (Ti1/2W1/2)5+ 添加量的逐渐增加，0.84MgNb2-x(Ti1/2W1/2)xO6-0.16CaTiO3 陶瓷的体积密度增加，烧结温度没有明显变化，陶瓷晶胞体积减小，材料极化率和填充率降低，导致陶瓷介电常数εr 下降，品质因数 Q × f 增加，频率温度系数 τf 变为正值。x = 0.05 的 0.84MgNb1.95(Ti1/2W1/2)0.05O6-0.16CaTiO3 陶瓷在 1250 °C 下烧结，保温时间为 4 小时，具有最佳的微波介电性能：εr = 21.52，Q × f = 96983 GHz，τf = - 3.8 × 10-6/ °C。

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来源期刊

Journal of Materials Science: Materials in Electronics 工程技术-材料科学：综合

CiteScore

5.00

自引率

7.10%

发文量

1931

审稿时长

2 months

期刊介绍： The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.