Investigation of the microwave dielectric properties of the Li4x/3Zn2?2xTi1+2x/3O4 system by P–V–L theory and vibration spectroscopy |
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| Affiliation: | 1. Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei University, Wuhan, 430062, China;2. Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China;3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China |
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| Abstract: | Li4x/3Zn2–2xTi1+2x/3O4 microwave dielectric ceramics with a spinel phase were prepared via a high-temperature solid-phase method. P–V–L theory, vibration spectra, and XPS were utilized to establish the links between the intrinsic and extrinsic factors and the microwave dielectric properties. According to the characterization, the change in permittivity (εr) was ascribed to the increase in the average bond ionicity of Ti–O(AfiTi-O) and the polar mode of the lattice vibration; the change in quality factor(Q × f) resulted from the change in the Ti–O lattice energy (AUTi-O) and existence of oxygen vacancy; the increase in temperature coefficient of the resonance frequency (τf) was triggered by the increase in the Ti–O bond energy. The Li0.6Zn1.1Ti1.3O4 ceramics (x = 0.45) sintered at 1125 °C finally obtained optimal microwave dielectric constants of εr = 17.3, Q × f = 76,318 GHz and τf = -58 ppm/°C. |
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| Keywords: | Microwave dielectric properties Spinel structure P–V–L theory Vibrational spectra |
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