A New Microwave Dielectric Ceramic for LTCC Applications
A New Microwave Dielectric Ceramic for LTCC Applications
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DOI：
10.1111/j.1551-2916.2006.00942.x
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发表时间：
2006-05
影响因子：
3.9
通讯作者：
Q. Zeng;Wei Li;Jianlin Shi;Jing-kun Guo;Min Zuo;Wenjun Wu
中科院分区：
文献类型：
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作者：
Q. Zeng;Wei Li;Jianlin Shi;Jing-kun Guo;Min Zuo;Wenjun Wu
在Li2O-Nb2O5-TiO2四元系中发现并研究了一种新型低温微波介质陶瓷Li2TiO3固溶体。化合物组成为Li2.081Ti0.676Nb0.243O_3，为单斜晶系。这种新型微波介质陶瓷具有较低的介电常数(∼20)、较高的Q×f值(高达50 000(7.8 GHz))和近零的温度系数(13 ppm/°C)。添加≤2 wt%B_2O_3对降低烧结温度(Ts)非常有效，在ts≤900°C时可获得致密的陶瓷。显然，该陶瓷有望成为多层低温共烧陶瓷的候选材料。
A new low-sintering temperature microwave dielectric ceramic, the Li2TiO3 solid solution, was found and investigated in the Li2O–Nb2O5–TiO2 system. The compound with the composition of Li2.081Ti0.676Nb0.243O3 crystallizes as a monoclinic structure. This new microwave dielectric ceramic shows a relatively low permittivity (∼20), high Q×f values up to 50 000 (7.8 GHz), and near-zero temperature coefficients (13 ppm/°C), which were obtained via sintering at 1100°C. The addition of ≤2 wt% B2O3 was very effective in lowering the sintering temperature (Ts), and dense ceramics could be obtained at Ts≤900°C. The addition of B2O3 does not induce apparent degradation in the microwave properties but lowers the τf value to near zero. It is obvious that the ceramics could be promising candidates for multilayer low-temperature co-fired ceramics applications.