Microwave dielectric properties of lead borosilicate glass-Al₂O₃ composites

Microwave dielectric properties of lead borosilicate glass-Al₂O₃ composites

A lead borosilicate (PBS) glass-Al₂O₃ composite was prepared and its microwave dielectric properties were investigated. Although the anorthite-type phase was observed above 800oC, this phase might have crystallized from the PBS glass because the PBS glass originally contained the constituents of the anorthite phase and a one-stage sintering behavior was conducted. The densification behavior was suggested to occur through a non-reactive liquid phase sintering. The dielectric constant (εr), the quality factor (Q×f0), and the temperature coefficient of the resonant frequency (τf) of the 50 vol% PBS glass-Al₂O₃ composite sintered at 900oC were 9.26, 4 941 GHz, and −38 ppm/K, respectively.

A lead borosilicate (PBS) glass-Al₂O₃ composite was prepared and its microwave dielectric properties were investigated. Although the anorthite-type phase was observed above 800oC, this phase might have crystallized from the PBS glass because the PBS glass originally contained the constituents of the anorthite phase and a one-stage sintering behavior was conducted. The densification behavior was suggested to occur through a non-reactive liquid phase sintering. The dielectric constant (εr), the quality factor (Q×f0), and the temperature coefficient of the resonant frequency (τf) of the 50 vol% PBS glass-Al₂O₃ composite sintered at 900oC were 9.26, 4 941 GHz, and −38 ppm/K, respectively.