Abstract
Microwave characteristics of BaTi4O9 ceramics combined with different amounts of MgO–CaO–SiO2–Al2O3 (MCAS) glass and sintered at different temperatures were examined. The temperature needed to densify the BaTi4O9 dielectric is lowered with an increase of the content of MCAS glass. The densities and the dielectric constants of densified MCAS-BaTi4O9 ceramics decrease with the an increasing amount of MCAS glass. The results of X-ray diffraction (XRD) patterns indicate that BaTi4O9 and MCAS glass (cordierite phase) exist as two different phases. For BaTi4O9 with 3 wt% addition of MCAS, the sintering temperature is lowered to 1200°C, and the ceramics have the optimum dielectric properties: Q=5720 (Q×f=42050), εr values=34.6, and τf=14.2.