High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion
The rapid development of fifth-/sixth-generation telecommunication technologies has increased the demand for silicate ceramic materials with low permittivity and low dielectric loss. However, few silicate ceramics with ultrahigh Q×f values (≥ 200,000 GHz) have been developed to date. In this study,...
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Tsinghua University Press
2025-04-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2025.9221053 |
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| author | Yutian Lu Weijia Guo Chongyang Zhang Hui Zhang Zhenxing Yue |
| author_facet | Yutian Lu Weijia Guo Chongyang Zhang Hui Zhang Zhenxing Yue |
| author_sort | Yutian Lu |
| collection | DOAJ |
| description | The rapid development of fifth-/sixth-generation telecommunication technologies has increased the demand for silicate ceramic materials with low permittivity and low dielectric loss. However, few silicate ceramics with ultrahigh Q×f values (≥ 200,000 GHz) have been developed to date. In this study, a slight substitution of Ge4+ ions in MgSi1−xGexO3 (MSGx, x = 0 to 0.6) ceramics caused a phase transition from clinoenstatite (x = 0) to orthoenstatite (x = 0.2), and the Q×f value increased from 70,600 GHz to 148,800 GHz. Following the phase transition, the cations change from a “compressed” state to a “rattle” state, and the lattice distortion continues to rise with x, resulting in the optimal microwave dielectric properties (εr = 7.21, Q×f = 259,300 GHz) of the MgSi0.5Ge0.5O3 ceramics. Significant discrepancies in the dielectric properties are found in the microwave and terahertz bands. There is an anomalous increase in εr and a decrease in the Q×f value in the terahertz band, which is due to the change in polar phonon modes revealed by the terahertz time-domain spectra. Consequently, MgSi0.7Ge0.3O3 ceramics display superior dielectric properties, with εr = 7.02, Q×f = 191,300 GHz in the terahertz band. These novel materials have the potential to serve as promising dielectric materials for future microwave or terahertz mobile communication systems. |
| format | Article |
| id | doaj-art-b3426a3a945642d9bc84f2d04e9c9699 |
| institution | DOAJ |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-b3426a3a945642d9bc84f2d04e9c96992025-08-20T03:13:47ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082025-04-01144922105310.26599/JAC.2025.9221053High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortionYutian Lu0Weijia Guo1Chongyang Zhang2Hui Zhang3Zhenxing Yue4State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaThe rapid development of fifth-/sixth-generation telecommunication technologies has increased the demand for silicate ceramic materials with low permittivity and low dielectric loss. However, few silicate ceramics with ultrahigh Q×f values (≥ 200,000 GHz) have been developed to date. In this study, a slight substitution of Ge4+ ions in MgSi1−xGexO3 (MSGx, x = 0 to 0.6) ceramics caused a phase transition from clinoenstatite (x = 0) to orthoenstatite (x = 0.2), and the Q×f value increased from 70,600 GHz to 148,800 GHz. Following the phase transition, the cations change from a “compressed” state to a “rattle” state, and the lattice distortion continues to rise with x, resulting in the optimal microwave dielectric properties (εr = 7.21, Q×f = 259,300 GHz) of the MgSi0.5Ge0.5O3 ceramics. Significant discrepancies in the dielectric properties are found in the microwave and terahertz bands. There is an anomalous increase in εr and a decrease in the Q×f value in the terahertz band, which is due to the change in polar phonon modes revealed by the terahertz time-domain spectra. Consequently, MgSi0.7Ge0.3O3 ceramics display superior dielectric properties, with εr = 7.02, Q×f = 191,300 GHz in the terahertz band. These novel materials have the potential to serve as promising dielectric materials for future microwave or terahertz mobile communication systems.https://www.sciopen.com/article/10.26599/JAC.2025.9221053microwave dielectric propertyterahertz spectroscopyenstatitelow dielectric losslow permittivity |
| spellingShingle | Yutian Lu Weijia Guo Chongyang Zhang Hui Zhang Zhenxing Yue High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion Journal of Advanced Ceramics microwave dielectric property terahertz spectroscopy enstatite low dielectric loss low permittivity |
| title | High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| title_full | High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| title_fullStr | High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| title_full_unstemmed | High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| title_short | High-Q enstatite microwave/terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| title_sort | high q enstatite microwave terahertz dielectric ceramics modulated by phase transition and lattice distortion |
| topic | microwave dielectric property terahertz spectroscopy enstatite low dielectric loss low permittivity |
| url | https://www.sciopen.com/article/10.26599/JAC.2025.9221053 |
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