High-performance microwave dielectric glass-ceramic with fine secondary structure for ULTCC application |
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| Affiliation: | 1. School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;2. Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Key Laboratory of Sensor and Sensing Technology of Gansu Province & Institute of Sensor Technology, Gansu Academy of Sciences, Lanzhou 730000, China;1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China;2. School of Science, Xi’an University of Posts and Telecommunications, Xi’an 710121, China;1. College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China;2. Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Hubei Three Gorges Laboratory, Yichang 443007, China;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou, China;2. College of Materials Science and Engineering, Liaocheng University, Liaocheng, China |
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| Abstract: | x ZnO- (100-x) B2O3 (x = 45–64 mol%) glass-ceramics for ULTCC applications were prepared via the solid-state reaction method, and their crystallization behavior, sintering mechanism, microstructure and microwave dielectric properties were investigated. In this work, the zinc boron binary glasses can be formed in the range of 45–73 mol% ZnO content, and the glass with 55 mol% ZnO content has the highest glass-forming ability. The Zn4B6O13 crystal is formed in binary ZnO-B2O3 glass at 640 °C, which is much lower than that in ceramics. The glass-ceramics exhibit large grains with 5 ～ 10 µm consisting of fine and uniform secondary structures. The precipitation of Zn4B6O13 crystal and the refinement secondary structure improves the microwave dielectric properties. The 55 ZnO - 45 B2O3 glass-ceramic sintered at 640 °C for 5 h exhibits the optimum microwave dielectric properties of εr = 6.09, Q×f = 20,389 GHz, τf = 14 ppm/°C, and also high Vickers hardness of 625 kgf/mm2 and good chemical compatibility with Ag or Al electrode, which is a good candidate for ULTCC substrate materials. |
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| Keywords: | ULTCC Zinc borate glass-ceramics Crystallization behavior Microstructure Microwave dielectric properties |
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