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The MgTiO 3 - x  wt%CuO-Bi 2 O 3 -Nb 2 O 5 -LiF-SiO 2  (CBNLS, 4 ≤  x  ≤ 10) ceramics were prepared by a solid-state reaction method for developing low-fired microwave dielectric ceramics. The sintering temperatures of MgTiO 3  ceramics were successfully lowered to 1000 °C due to CBNLS liquid phase sintering. With increasing  x , the dielectric constant ( ε r) increased from 16.5 to 18.6 and the quality factor ( Q  ×  f ) decreased from 13,920 to 4460 GHz, respectively. The well microwave dielectric properties of ɛr= 16.9,  Q × f  = 7567 GHz, and  τ f= −54.7 ppm/°C were obtained for MgTiO 3 -6wt% CBNLS ceramics.

Effect of Glass Additions on Sintering Behavior and Dielectric Properties of MgTiO 3 Ceramics