Preparation and microwave dielectric properties of BaLi1+xF3+x (x = 0–0.01) ceramics |
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| Affiliation: | 1. School of Microelectronics, Tianjin University, Tianjin 300072, PR China;2. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China;3. Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, PR China;1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230601, China;1. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China;2. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, PR China;3. Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an, Shaanxi, 710071, PR China;1. Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, Hubei 430062, China;2. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;1. Yantai University, Yantai, 264005, Shandong, China;2. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China |
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| Abstract: | BaLi1+xF3+x (x = 0–0.01) were successfully mechanosynthesized by a simple ball-milling process. The effects of excessive LiF and sintering method and/or annealing atmosphere on its sintering behavior, microstructure, and microwave dielectric properties have been investigated in this paper. The mechanosynthesized powder can be densified with relative densities of ～95 % after sintering at 750–800 °C/2 h in N2. The obtained ceramics exhibit excellent optimized microwave dielectric properties with εr of ～11.46 ± 0.06, Q×f values of 83175 ± 1839 GHz and τf of ～ ? 70 ± 3 ppm/°C at the x = 0.006 composition. Its Q×f value could be improved to 94603 ± 2037 GHz) by post-annealing in N2 after post annealing at 700 °C/2 h. The Q×f value could be further improved to (120,098 ± 2344 GHz) by hot-pressed sintering (HPS). Sintering in the ambient atmosphere or O2 leads to lower Q×f values than those of the counterparts sintered in N2 due to the introduction of F-vacancies by oxidation, while little variation in εr andτf. |
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| Keywords: | Sintering behavior Oxidation of fluorides Microwave dielectric properties |
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