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Microwave dielectric properties of a temperature-stable and ultra-low sintering Li3AlMo3O12/Li0.5Bi0.5MoO4 composite ceramics for ULTCC application

Chun Tong,Xinlei Shen,Chang Feng,Xia Feng,Haikui Zhu,Lixi Wang

Temperature-stable ULTCC composite (1- x )Li 3 AlMo 3 O 12 - x Li 0.5 Bi 0.5 MoO 4 ceramics were prepared by solid-state reaction method. X-ray and EDS results showed that Li 3 AlMo 3 O 12 phase and Li 0.5 Bi 0.5 MoO 4 phase exist independently, and no other phase is generated. Due to the low sintering temperature of both two phases, the composite ceramics can obtain high density at 560 ℃. Microwave dielectric properties mainly depend on the ceramic Li 0.5 Bi 0.5 MoO 4 content x , the addition of Li 0.5 Bi 0.5 MoO 4 effectively increases the τ f of Li 3 AlMo 3 O 12 from −65.05 ppm/℃ to 4.96 ppm/℃, but caused the dielectric loss increase. When x =0.45 and sintered at 560 ℃, microwave dielectric properties of 0.55Li 3 AlMo 3 O 12 -0.45Li 0.5 Bi 0.5 MoO 4 ceramics with close zero τ f : ε r = 15.32, Q × f = 13,158 GHz, τ f = 4.96 ppm/℃.