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Effects of Additives on the Densification and Microwave Dielectric Properties of Binary CaO–B₂O₃–SiO₂ Glass

Sea-Fue Wang, Chuang-Chung Chiang, Yuh-Ruey Wang, and Yung-Fu Hsu

(Received July 18, 2009; accepted October 15, 2009; published online February 22, 2010)

Glass systems, consisting of binary CaO–B₂O₃–SiO₂ (CBS) glass (referred to as glass AB) and various amounts of Li₂CO₃, TiO₂, and Al₂O₃ additives, were prepared in this study. The effects of the additives on the densification and microwave dielectric properties of binary CBS glass were investigated. Binary glass AB was not densified until the sintering temperature reached 875 °C; however, with the addition of 1 wt % Li₂CO₃ (referred to as glass L1), the glass achieved a maximum density at 825 °C. The resultant glass-ceramics contained a major phase quartz, SiO₂, and a minor phase, CaB₂O₄, and had a dielectric constant (ε_r) varying from 4.10 to 4.23 and a minimum tan δ of 0.0015, as frequency increased from 4.3 to 18.6 GHz. For glass L1 with further addition of the ceramic filler Al₂O₃ (up to 30 wt %), the maximum densification was reached at 775 °C and the formation of CaB₂O₃ and SiO₂ crystallites was suppressed. Both ε_r and tan δ increased with the Al₂O₃ content of the glass-ceramics. Further addition of the crystallization agent TiO₂ (up to 5 wt %) to glass L1 slightly reduced the sintering temperature to 800 °C. The X-ray diffraction (XRD) intensities of the quartz SiO₂ and CaB₂O₄ crystallites as well as the ε_r and tan δ values of the resultant glass-ceramic increased with the amount of TiO₂ added.

URL: http://jjap.jsap.jp/link?JJAP/49/021101/
DOI: 10.1143/JJAP.49.021101

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