Abstract
The effect of crystallization on microwave dielectric properties of cordierite glasses containing B 2 O 3 and P 2 O 5 additions was investigated. Two glasses containing 5 wt% B 2 O 3 /5 wt% P 2 O 5 and 7.5 wt% B 2 O 3 /7.5 wt% P 2 O 5 were studied. Both glasses were sintered to nearly full density at temperatures as low as 860 °C. The frequency constant and quality factor of α cordierite are, respectively, about five times and two times larger than those of glassy phase and μ cordierite. The temperature coefficients of resonant frequency are estimated to be about -13, -55, and -15 ppm/°C for glassy phase, μ cordierite, and α cordierite, respectively. As a result of the microwave dielectric properties of the individual phase, cordierite glasses containing α cordierite possess the best microwave properties.