소결온도에 따른 $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ 세라믹스의 마이크로파 유전 특성

Microwave Dielectric Properties of the $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ Ceramics with Sintering Temperature

The structural and microwave dielectric properties of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics with sintering temperature were investigated. All the sample of the $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics were prepared by conventional mixed oxide method and sintered at $1425^{\circ}C{\sim}1500^{\circ}C$. According to XRD Patterns, hexagonal $Mg_4Ta_2O_9$ phase and cubic $SrTiO_3$ Phase were coexisted. The porosity of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics were reduced with increasing sintering temperature. In the case of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics sintered at $1475^{\circ}C$, dielectric constant, quality factor and temperature coefficient of resonant frequency were 14.51, 82,596GHz and $-3.14ppm/^{\circ}C$, respectively.