A new microwave ceramic with low-permittivity for LTCC applications

作者：Zhang Qi Long^*; Yang Hui; Sun Hui Ping

来源：Journal of the European Ceramic Society, 2008, 28(3): 605-609.

DOI：10.1016/j.jeurceramsoc.2007.07.003

• dielectric properties
• microwave ceramic
• (Ca, Mg)SiO3
• Li2CO3
• LTCC

A new low-temperature microwave dielectric ceramic with low-permfttivity was found and investigated in the CaO-MgO-SiO2-TiO2 system. Phase constitutes and dielectric properties of (Ca1-x,Mg-x)SiO3 (x = 0.1-0.5) ceramics were studied with different x contents, and CaTiO3 demonstrated an effective compensation in (Ca1-x,Mg-x)SiO3 tau(f) value. The 0.88CaMgSi(2)O(6)-0.12CaTiO(3) Compositions show a relatively low-permittivity (similar to 9.42), high Q x f values up to 52,800GHz, andnear-zero temperature coefficients (5.6ppm/degrees C), which were obtained via sintering at 1300 degrees C. The addition of <= 2.Owt% Li2CO3-V2O5 was very effective in lowering the sintering temperature (T-s), and dense ceramics could be obtained at T-s <= 900 degrees C. The addition of LiCO3-V2O5 does not induce apparent degradation in the microwave properties. The specimens with 1 wt% Li2CO3-V2O5 sintered at 880 degrees C for 2 h shows excellent dielectric properties: epsilon(r) = 9.23, Q x f=46,200GHz, and tau(f) = 1.3 ppm/degrees C. The low-temperature sintering ceramics powders were suitable for the tape casting process. Also, the material is compatible with Ag electrodes, and therefore, is suitable for LTCC application.

• 出版日期2008
• 单位浙江大学