A Novel Low-Firing and Low Loss Microwave Dielectric Ceramic Li2Mg2W2O9 with Corundum Structure

作者：Guo, Huanhuan; Fang, Liang^*; Jiang, Xuewen; Li, Jie; Lu, Fengqi; Li, Chunchun

来源：Journal of the American Ceramic Society, 2015, 98(12): 3863-3868.

DOI：10.1111/jace.13829

• BOND-VALENCE PARAMETERS
• SINTERING TEMPERATURE
• CRYSTAL-STRUCTURE
• W CERAMICS
• ZN
• MG
• PHASE
• METAL
• MO
• NI

The crystal structure and microwave dielectric properties of a novel low-firing compound Li2Mg2W2O9 were investigated in this study. The phase purity and crystal structure were investigated using X-ray diffraction analyses and Rietveld refinement. The best microwave dielectric properties of the ceramic with a low permittivity (er) similar to 11.5, a quality factor (Q x f) similar to 31 900 GHz (at 10.76 GHz) and a temperature coefficient of the resonant frequency (tau(f)) similar to -66.0 ppm/degrees C were obtained at the optimum sintering temperature (920 degrees C). CaTiO3 was added into the Li2Mg2W2O9 ceramic to obtain a near zero tau(f), and 0.93Li(2)Mg(2)W(2)O(9)-0.07CaTiO(3) ceramic exhibited improved microwave dielectric properties with a near-zero tau(f) similar to -1.3 ppm/degrees C, a epsilon(r) similar to 21.6, a high Q(u) x f value similar to 20 657 GHz. The low sintering temperature and favorable microwave dielectric properties make it a promising candidate for LTCC applications.

• 出版日期2015-12
• 单位广西大学; 桂林理工大学