A novel low-fired,temperature-stable,and low-cost (1−x)BaCu(B2O5)−xTiO2 microwave dielectric ceramic |
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| Authors: | Yong-jun Gu Li-wei Lei Jin-liang Huang Xing-hua Yang Qian Li Li-hua Li Xin-li Li Bok-hee Kim |
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| Affiliation: | 1. Henan Key Laboratory of Research for Central Plains Ancient Ceramics, Pingdingshan University, China;2. Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang 471023, China;3. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;4. Department of Electronic Materials Engineering, Chonbuk National University, Republic of Korea |
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| Abstract: | BaCu(B2O5) is a typical microwave dielectric ceramic (MDC) with a low sintering temperature, but it exhibits a large negative temperature coefficient of resonant-frequency (τf) which makes it difficult to use in wireless communications. We employ TiO2 to improve its temperature-stability of resonant-frequency, and reveal the effects of TiO2 on the densification and the microwave dielectric properties of BaCu(B2O5). Here we show that BaCu(B2O5) can be well-sintered at 825 °C with proper TiO2 additions; we find that the TiO2 grains homogeneously distribute in the boundaries of BaCu(B2O5) grains, resulting in the τf compensation of BaCu(B2O5). Enhanced temperature-stability of resonant-frequency can be achieved by increasing the content of TiO2 properly. A novel temperature-stable (1-x)BaCu(B2O5)–xTiO2 (x = 0.20) MDC (τf =?0.8 ± 3.0 ppm/°C, εr = 8.8 ± 0.36, Q×f = 28,612 ± 1170 GHz) is obtained using some low-cost raw materials. Our results provide the underlying insights needed to guide the design of temperature-stable MDCs for wireless communication applications. |
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| Keywords: | Corresponding author at: Henan Key Laboratory of Research for Central Plains Ancient Ceramics Pingdingshan University China Microwave dielectric ceramics Temperature-stable Cost-saving |
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