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Microwave dielectric properties of Li2Mg2Ga2Ti3O12 ceramics with spinel-type

Chang Jiang,Linzhao Ma,Guo Tian,Longxiang Jiang,Hongzhi Xiao,Qianbiao Du,Hao Li

Novel spinel-type Li 2 Mg 2 Ga 2 Ti 3 O 12 ceramics were prepared by the solid-state method. Rietveld refinement revealed that the Li 2 Mg 2 Ga 2 Ti 3 O 12 ceramics possess a cubic spinel structure with the F d 3 ‾ m ( 227 ) space group. Raman spectrum analysis indicated that the Q  ×  f and FWHM of ceramics exhibit an inverse relationship. According to the P-V-L theory, the Ti-O bond has the highest percentage of contribution to both of bond ionicity and lattice energy, indicating a significant impact on ε r and Q  ×  f , respectively. The Li 2 Mg 2 Ga 2 Ti 3 O 12 ceramics showed the best microwave dielectric properties ( ε r  = 15.72, Q  ×  f  = 69,633 GHz, and τ f  = −20 ppm/°C), sintering at an optimum temperature of 1200 °C. Additionally, a dielectric resonance antenna, on the basis of Li 2 Mg 2 Ga 2 Ti 3 O 12 ceramics was designed and simulated.