The Microwave Dielectric Properties of $ZnNb_2O_6$ Ceramics with CUO and $B_2O_3$

CuO와 $B_2O_3$를 첨가한 $ZnNb_2O_6$ 세라믹스의 마이크로파 유전특성

The $ZnNb_2O_6$ ceramics with 5wt% CuO and 5wt% $B_2O_3$ were prepared by the conventional mixed oxide method. The ceramics were sintered at the temperature of $950^{\circ}C\sim1025^{\circ}C$ for 3hr. in air. The structural properties were investigated with sintering temperature by XRD and SEM. Also, the microwave dielectric properties were investigated with sintering temperature. Increasing the sintering temperature, the peak of second phase ($Cu_3Nb_2O_8$) was increased. But no significant difference was observed as sintering temperature. In the $ZnNb_2O_6$ ceramics with 5wt% CuO and 5wt% $B_2O_3$ sintered at $975^{\circ}C$ for 3hr, the dielectric constant, quality factor and temperature coefficient of the resonant frequency were 19.30, 14,662GHz, +4.1$8ppm/^{\circ}C$, respectively.