Crystal structures and microwave dielectric properties of low-firing Ca5Zn4-xMgxV6O24 ceramics |
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| Authors: | Bo Li Jiawei Tian Lei Qiu |
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| Affiliation: | 1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu, China;3. National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, China |
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| Abstract: | Ca5Zn4-xMgxV6O24 (x?=?0–3) microwave dielectric ceramics with low sintering temperature were synthesized via the conventional solid-state reaction. Effects of the substitution of Mg2+ for Zn2+ on crystal structures and microwave dielectric properties were investigated. XRD and Rietveld refinement showed the solid solution single phase formed when 0?≤?x?≤?2, but a few ZnO was observed when x?=?3. Meanwhile, the lattice parameters were found to decrease monotonously with Mg content increasing. The vibration modes of Raman were confirmed and the relationship with microwave dielectric properties was analyzed. Appropriate substitution of Mg2+ improved the packing fraction, the cation ordering degree, and the Y-site bond valence, contributing to high Q×f and low | τf |. However, the εr reduced with the increasing content of Mg2+ due to the decrease of ion polarizability. Finally, the best microwave dielectric properties were achieved at x?=?2 with εr =?11.0, Q?×?f?=?66,365?GHz (at 10.0?GHz), and τf =??80.4?ppm/°C. |
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| Keywords: | Substitution Crystal structure Microwave dielectric property |
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