| Title |
Structural and Microwave Dielectric Properties of the Ba_5B_4O_{15} (B=Ta, Nb) Ceramics with Sintering Temperature |
| Authors |
이승준(Lee, Sung-Jun) ; 김재식(Kim, Jae-Sik) ; 류기원(Ryu, Ki-Won) ; 이영희(Lee, Young-Hie) |
| Keywords |
Cation-deficient perovskiteBa_5Ta_4O_{15}Ba_5Nb_4O_{15} ; Quality factor |
| Abstract |
In this study, both structural and microwave dielectric properties of the Ba_5B_4O_{15} (B=Ta, Nb) cation-deficient perovskite ceramics with sintering temperature were investigated. All samples of the Ba_5B_4O_{15} (B=Ta, Nb) ceramics were prepared by the conventional mixed oxide method and sintered at 1325°C~1575°C. The bulk density and dielectric constant of the Ba_5Ta_4O_{15} ceramics were increased continuously with increasing of sintering temperature. The quality factor of the Ba_5Ta_4O_{15} ceramics was increased in as the sintering temperature increases from 1375°C~1475°C but decreased at the temperatures above 1475°C. And the bulk density, dielectric constant and quality factor of the Ba_5Nb_4O_{15} ceramics were increased in as the sintering temperature increases from 1325°CP~1400°C but decreased at the temperatures above 1400°C. In the case of the Ba_5Ta_4O_{15} sintered at 1475°C and Ba_5Nb_4O_{15} ceramics sintered at 1400°C, the dielectric constant, quality factor, and temperature coefficient of the resonant frequency (TCRF) were 25.15, 53,105 GHz, -3.06 ppm/°C and 39.55, 28,052 GHz, +5.7 ppm/°C, respectively. |