Microwave dielectric properties of Ca[(Li1/3Nb2/3)1-xTix]O3-δ-Lithium Magnesium Zinc borosilicate ceramic-glass composite for LTCC applications

2007 IEEE Applied Electromagnetics Conference (AEMC) Pub Date : 2007-12-01 DOI:10.1109/AEMC.2007.4638032

S. George, M. Sebastian

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Abstract

The Ca[(Li_1/3Nb_2/3)_1-xTi_x]O_3-delta (x=0.2 and 0.25) (CLNT) ceramics with Lithium Magnesium Zinc Borosilicate (LMZBS) glasses were prepared by conventional solid state ceramic route. The crystal structure and microstructure of the glass added and sintered CLNT ceramics were studied using X-ray diffractometer and Scanning electron microscope. The addition of LMZBS glasses improved the densification and lowered the sintering temperature of CLNT ceramics from 1175degC to 900degC without degrading the microwave dielectric properties. The tau_f value is tuned by increasing the titanium content in the Ca[(Li_1/3Nb_2/3)_0.8Ti_0.2]O_3-delta ceramics. The Ca[(Li_1/3Nb_2/3)_0.75Ti_0.25]O_3-delta ceramics with 12 wt% of LMZBS and sintered at 900degC/4h has epsiv_tau=28.52, Q_uxf =11000 GHz and tau_f = -3 ppm/degC. This results shows that the Ca[(Li_1/3Nb_2/3)_0.75Ti_0.25]O_3-delta ceramics with suitable amount of LMZBS glass addition can find application in LTCC based devices.

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LTCC用Ca[(Li1/3Nb2/3)1-xTix]O3-δ-硼硅锂镁锌陶瓷-玻璃复合材料的微波介电性能

采用传统的固相陶瓷工艺制备了Ca[(Li1/3Nb2/3)1-xTix] o3 - δ (x=0.2和0.25)(CLNT)含硼硅酸锂镁锌(LMZBS)玻璃的陶瓷。用x射线衍射仪和扫描电镜研究了添加和烧结的CLNT陶瓷的晶体结构和微观结构。LMZBS玻璃的加入提高了CLNT陶瓷的致密性，并将烧结温度从1175℃降低到900℃，但没有降低其微波介电性能。通过增加Ca[(Li1/3Nb2/3)0.8Ti0.2] o3 - δ陶瓷中钛的含量来调节tauf值。在900℃/4h下烧结的Ca[(Li1/3Nb2/3)0.75Ti0.25] o3 - δ陶瓷，LMZBS含量为12wt %，其正负电位=28.52,Quxf =11000 GHz, tauf = -3 ppm/℃。结果表明，添加适量LMZBS玻璃的Ca[(Li1/3Nb2/3)0.75Ti0.25] o3 - δ陶瓷可以在LTCC基器件中得到应用。

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2007 IEEE Applied Electromagnetics Conference (AEMC)

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