Microwave dielectric properties of Ca[(Li1/3Nb2/3)1−x
Tix]O3−δ ceramics with glass |
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Authors: | Jong-Yoon Ha Ji-Won Choi Chong-Yun Kang Seok-Jin Yoon Doo Jin Choi Hyun-Jai Kim |
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Affiliation: | (1) Thin Film Materials Research Center, KIST, Seoul, 130-650, Korea;(2) Dept. of Ceramic Eng., Yonsei Univ., Seoul, 120-749, Korea |
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Abstract: | The effect of the addition of glass on the densification, low temperature sintering, and microwave dielectric properties of
the Ca(Li1/3Nb2/3)1−x
Tix]O3−δ(CLNT) was investigated. Addition of glass (B2O3-ZnO-SiO2-PbO system) improved the densification and reduced the sintering temperature from 1150∘C to 900∘C of Ca(Li1/3Nb2/3)1−x
-Tix]O3−δ microwave dielectric ceramics. As increasing glass contents from 10 wt% to 15 wt%, the dielectric constants (εr) and bulk density were increased. The quality factor (Q⋅f0), however, was decreased slightly. The temperature coefficients of the resonant frequency (τf) shifted positive value as increasing glass contents over Ti content is 0.2 mol. The dielectric properties of Ca(Li1/3Nb2/3)0.75Ti0.25]O3−δ with 10 wt% glass sintered at 900∘C for 3 h were εr = 40 Q·f0 = 11500 GHz, τf = 8, ppm/°C. The relationship between the microstructure and dielectric properties of ceramics was studied by X-ray diffraction
(XRD), and scanning electron microscope (SEM). |
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Keywords: | Microwave Dielectric LTCC Addition of glass |
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