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소결온도에 따른 0.7Ba(Mg,Ta)O$_3$-0.3Ba(Co,Nb)O$_3$세라믹스 마이크로파 유전특성에 관한연구
이문기,김남영,이영희,Lee, Moon-Kee,Kim, Nam-Young,Lee, Young-Hie 대한전기학회 2001 전기학회논문지C Vol.50 No.3
$0.7Ba(Mg{\frac}_{1}{3}Ta{\frac}_{1}{3})O_3-0.3Ba({\frac}_{1}{3}Nb{\frac}_{1}{3})O_3ceramics$ were prepared by the conventional mixed oxide method. The ceramics were sintered at the temperature of $1500{\sim}1575[^{\circ}C]$ for 5 hours in air. The microwave dielectric properties of the specimens were investigated with sintering temperature. The 0.7BMT-0.3BCN ceramics showed typical XRD patterns of the complex perovskite structure. Dielectric constant and quality factor were increased with increasing the sintering temperature. In the case of the specimens sintered at $1575[^{\circ}C]$ for 5 hours, dielectric constant, quality factor and temperature coefficient of resonant frequency were good values of 28,23545 at 10[㎓] and -1.2 $[ppm/^{\circ}C]$, respectively.
소결온도에 따른 0.7Mg<sub>4</sub>Ta<sub>2</sub>O<sub>9</sub>-0.3SrTiO<sub>3</sub> 세라믹스의 마이크로파 유전특성
김재식,최의선,이문기,이영희,배선기,Kim, Jae-Sik,Choi, Eui-Sun,Lee, Moon-Kee,Lee, Young-Hie,Bae, Seon-Gi 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6
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 miked oxide method and the sintering temperature was $1425\~1500^{\circ}C$. The hexagonal phase of $Mg_4Ta_2O_9$ and the cubic phase of $SrTiO_3$ 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, 82,596 GHz and $-3.14\;ppm/^{\circ}C$, respectively.