Li+ enrichment to improve the microwave dielectric properties of Li2ZnTi3O8 ceramics and the relationship between structure and properties |
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| Affiliation: | 1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;2. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China;2. School of Material Science and Engineering, Chang’an University, Xi’an 710064, China;1. Laboratory of Thin Film Techniques and Optical Test, Xi''an Technological University, Xi’an 710032, Shaanxi, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi''an 710049, 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. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Yangtze River Delta Research Institute of UESTC (Huzhou), Huzhou, 313000, 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 Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541004, China;2. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China |
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| Abstract: | Herein, Li+-enriched Li(1+x)2ZnTi3O8 ceramics are prepared via the solid-phase methods. As x increases, the unit cell volume gradually increases, while the grain size initially increases and then decreases gradually. The Li(1+0.06)2ZnTi3O8 ceramics exhibit the best dielectric properties: εr = 25.92, Q × f = 109534 GHz (@7.37 GHz, which is a 48 % increase compared with the stoichiometric counterpart.), and τf = ?8.21 ppm/°C. The complex chemical bond theory and Raman spectroscopy reveal that Ti-O bonds have a significant effect on the dielectric properties. An optimal Li+ enrichment leads to an overall reduction in the distortion of the Li/ZnO4 tetrahedra, resulting in a reduction in τf. First-principles calculations demonstrate that a suitable excess of Li+ leads to an increase in the band-gap as well as an enhanced electron cloud density in the internal space of the Li1/ZnO4 tetrahedra, thereby increasing the Q × f. In summary, Li+-enriched Li(1+0.06)2ZnTi3O8 ceramics are promising for a wide array of applications in microwave communications. |
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| Keywords: | Microwave dielectric Spinel Raman vibration Chemical bond theory First-principles calculation |
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