A novel low-fired, temperature-stable, and low-cost (1−x)BaCu(B2O5)−xTiO2 microwave dielectric ceramic. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Gu, Yong-jun; Lei, Li-wei; Huang, Jin-liang; Yang, Xing-hua; Li, Qian; Li, Li-hua; Li, Xin-li; Kim, Bok-hee
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 1137
• Page End: 1141
• Publication Date: 2019-04
• Subjects: Microwave dielectric ceramics -- BaCu(B2O5) -- Temperature-stable -- Cost-saving; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.11.028
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: BaCu(B2 O5 ) is a typical microwave dielectric ceramic (MDC) with a low sintering temperature, but it exhibits a large negative temperature coefficient of resonant-frequency (τ f ) 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(B2 O5 ). Here we show that BaCu(B2 O5 ) can be well-sintered at 825 °C with proper TiO2 additions; we find that the TiO2 grains homogeneously distribute in the boundaries of BaCu(B2 O5 ) grains, resulting in the τ f compensation of BaCu(B2 O5 ). Enhanced temperature-stability of resonant-frequency can be achieved by increasing the content of TiO2 properly. A novel temperature-stable (1- x )BaCu(B2 O5 )– x TiO2 ( x = 0.20) MDC (τ f =−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.