TY - JOUR
T1 - Improved high-Q microwave dielectric resonator using ZnO and WO3-doped Zr0.8Sn0.2TiO4 ceramics
AU - Huang, Cheng Liang
AU - Hsu, Cheng Shing
AU - Lin, Ruei Jsung
N1 - Funding Information:
This work was supported by the National Science Council of the Republic of China under grant NSC89-2213-E-006-200.
PY - 2001/9/15
Y1 - 2001/9/15
N2 - The effect of WO3 addition on the microstructures and the microwave dielectric properties of Zr0.8Sn0.2TiO4 ceramics have been investigated. It is found that low-level doping of ZnO (1 wt%) and WO3 (up to 1 wt%) can significantly improve the density and dielectric properties of Zr0.8Sn0.2TiO4 ceramics. Zr0.8Sn0.2TiO4 ceramics with additives could be sintered to a theoretical density higher than 98% at 1340°C. Second phases were not observed at the level of 0.25-1 wt% WO3 addition. The dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted by WO3 addition. An εr value of 37.8, Q·f value of 61,000 (at 7 GHz), and τf value of -3.9 ppm/°C were obtained for 1 wt% ZnO-dop ed Zr0.8Sn0.2TiO4 ceramics with 0.25 wt% WO3 addition sintered at 1340°C.
AB - The effect of WO3 addition on the microstructures and the microwave dielectric properties of Zr0.8Sn0.2TiO4 ceramics have been investigated. It is found that low-level doping of ZnO (1 wt%) and WO3 (up to 1 wt%) can significantly improve the density and dielectric properties of Zr0.8Sn0.2TiO4 ceramics. Zr0.8Sn0.2TiO4 ceramics with additives could be sintered to a theoretical density higher than 98% at 1340°C. Second phases were not observed at the level of 0.25-1 wt% WO3 addition. The dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted by WO3 addition. An εr value of 37.8, Q·f value of 61,000 (at 7 GHz), and τf value of -3.9 ppm/°C were obtained for 1 wt% ZnO-dop ed Zr0.8Sn0.2TiO4 ceramics with 0.25 wt% WO3 addition sintered at 1340°C.
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U2 - 10.1016/S0025-5408(01)00677-8
DO - 10.1016/S0025-5408(01)00677-8
M3 - Article
AN - SCOPUS:0035885457
SN - 0025-5408
VL - 36
SP - 1985
EP - 1993
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 11
ER -