Microwave dielectric properties of BaTi4O9 ceramics with addition of dopant(CoO, Y2O3)

The BaTi₄O₉ ceramics with addition of CoO, Y₂O₃ were prepared by conventional mixed oxide method. The structural properties were investigated with sintering temperature by XRD. Also the microwave dielectric properties of the BaTi₄O₉ ceramics were studied. According to the X-ray diffraction patterns of the BaTi₄O₉ ceramics with CoO and Y₂O₃, the structure of the ceramics was orthorhombic. The dielectric constant, quality factor and temperature coefficient of resonant frequency of the BaTi₄O₉+CoO(0.5wt%) ceramics sintered at 1350°C, were 40.8, 39,680 and 2.5 ppm/°C, respectively. The dielectric constant, quality factor and temperature coefficient of resonant frequency of the BaTi₄O₉+Y₂O₃(0.5wt%) ceramics sintered at 1400°C, were 41.3, 40,900 and 3.2 ppm/°C, respectively.