Effects of (Cr0.5Ta0.5)4+ on the microstructure,chemical bond characteristics,and dielectric properties of molybdate-based ceramics at microwave and terahertz frequency |
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| Affiliation: | 1. Yantai University, Yantai, 264005, Shandong, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;3. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;4. Shandong Tongfang Luying Electronic Co., Ltd., Yinan, 276300, Shandong, China;1. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;2. Yantai University, Yantai, 264005, Shandong, China;1. Yantai University, Yantai, 264005, Shandong, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;3. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;4. SDEE Hitachi High-Voltage Switchgear Co.,Ltd., Jinan, 250000, Shandong, China;1. School of Environmental and Material Engineering, Yantai University, Yantai, 264005, Shandong, China;2. Yantai University, Yantai, 264005, Shandong, China;3. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;4. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;5. SDEE Hitachi High-Voltage Switchgear Co.,Ltd., Jinan, 250000, Shandong, China;1. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;2. School of Environmental and Material Engineering, Yantai University, Yantai, 264005, Shandong, China;1. School of Environmental and Material Engineering, Yantai University, Yantai 264005, Shandong, China;2. School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong, China;3. Shandong Tongfang Luying Electronic Co., Ltd., Yinan 276300, Shandong, China;4. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, China |
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| Abstract: | In this study, Ce2 Zr1?x (Cr0.5Ta0.5)x]3(MoO4)9 (x = 0.02–0.10) ceramics were synthesized using the solid-state reaction technique, and the crystalline parameters, sintering behaviors, chemical bond characteristics, infrared reflection spectrum, and dielectric response at microwave and terahertz frequency were examined. X-ray diffraction results demonstrated the crystallization of all ceramics in the trigonal structure (R-3c space group), and additional peaks were not detected. The densification point of ceramic was 875 °C. The addition of (Cr0.5Ta0.5)4+ significantly reduced the dielectric loss in the host ceramic. For Ce2 Zr0.96(Cr0.5Ta0.5)0.04]3(MoO4)9, outstanding microwave properties of εr = 10.66, Qf = 79,436 GHz, and τf = ?19.07 ppm/°C were obtained at 875 °C. The chemical bond characteristics were also parameterized to explore the relationship between Zr(CrTa)–O and microwave properties. Infrared spectral results further indicate that phonon vibrations lower than 400 cm?1 contribute to 80% of the polarization. In our comparison between the infrared spectrum and terahertz time-domain spectrum, we found that the permittivity extracted by the latter is closer to the observed value. |
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| Keywords: | Microwave dielectric properties Chemical bond characteristic Rietveld refinement Infrared spectrum Terahertz time-domain spectrum |
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