TY - JOUR
T1 - Dielectric properties of B2O3-doped 0.92(Mg 0.95Co0.05)2TiO4-0.08(Ca 0.8Sr0.2)TiO3 ceramics for microwave applications
AU - Li, Bing Jing
AU - Chen, Jhih Yong
AU - Huang, Guan Sian
AU - Jiang, Chang Yang
AU - Huang, Cheng Liang
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan under grant NSC 97-2221-E-006-013-MY3 .
PY - 2010/8/27
Y1 - 2010/8/27
N2 - The dielectric properties and microstructures of 0.92(Mg 0.95Co0.05)2TiO4-0.08(Ca 0.8Sr0.2)TiO3 ceramics with B2O 3 additions have been investigated. The sintered 0.92(Mg 0.95Co0.05)2TiO4-0.08(Ca 0.8Sr0.2)TiO3 ceramics were characterized by using X-ray diffraction spectra, scanning electron microscopy (SEM), backscattering electron image (BEI) and energy dispersive X-ray (EDX). The dielectric properties are strongly dependent on the densifications and the microstructures of the specimens. The decrease of Q × f value at high-level B2O3 addition was owing to the inhomogeneous grain growth and the high-dielectric-loss of the liquid phase. In comparison with that of pure 0.92(Mg0.95Co0.05)2TiO 4-0.08(Ca0.8Sr0.2)TiO3 ceramics, specimen with 0.5 wt% B2O3 addition possesses a substantial fine combination of dielectric properties (an εr of 18.07, a Q × f of 95,000 GHz at 9.5 GHz and a τf of -4.7 ppm/°C) at a lower sintering temperature of 1200 °C for 4 h. Moreover, a band-pass filter is also designed and simulated on the proposed dielectric to study its performance.
AB - The dielectric properties and microstructures of 0.92(Mg 0.95Co0.05)2TiO4-0.08(Ca 0.8Sr0.2)TiO3 ceramics with B2O 3 additions have been investigated. The sintered 0.92(Mg 0.95Co0.05)2TiO4-0.08(Ca 0.8Sr0.2)TiO3 ceramics were characterized by using X-ray diffraction spectra, scanning electron microscopy (SEM), backscattering electron image (BEI) and energy dispersive X-ray (EDX). The dielectric properties are strongly dependent on the densifications and the microstructures of the specimens. The decrease of Q × f value at high-level B2O3 addition was owing to the inhomogeneous grain growth and the high-dielectric-loss of the liquid phase. In comparison with that of pure 0.92(Mg0.95Co0.05)2TiO 4-0.08(Ca0.8Sr0.2)TiO3 ceramics, specimen with 0.5 wt% B2O3 addition possesses a substantial fine combination of dielectric properties (an εr of 18.07, a Q × f of 95,000 GHz at 9.5 GHz and a τf of -4.7 ppm/°C) at a lower sintering temperature of 1200 °C for 4 h. Moreover, a band-pass filter is also designed and simulated on the proposed dielectric to study its performance.
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U2 - 10.1016/j.jallcom.2010.06.051
DO - 10.1016/j.jallcom.2010.06.051
M3 - Article
AN - SCOPUS:77955562810
SN - 0925-8388
VL - 505
SP - 291
EP - 296
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1
ER -