Enhanced temperature stability of Li2Mg3SnO6-based ceramics by using BLCT composite additives

Li 2 Mg 3 SnO 6 - x wt%BLCT (Bi 2 O 3 -LiF-CaF 2 -TiO 2 , x  = 4, 8, 12, 16) ceramics were prepared. The sintering properties, phase composition, microstructure and microwave dielectric properties of Li 2 Mg 3 SnO 6 -based ceramics were studied when x increased from 4 to 16. The results show that all sintered samples are composed of the main phase Li 2 Mg 3 SnO 6 and the second phase Bi 2 O 3 , Mg 2 SnO 4 and CaSnO 3 . Appropriate BLCT additive significantly enhanced sintering ability and dielectric performance of Li 2 Mg 3 SnO 6 -based ceramics. The densification temperature of Li 2 Mg 3 SnO 6 -based ceramics decreased from 1360 °C to 1050 °C due to the addition of BLCT. With the increase of x , the value of quality factor ( Q  ×  f ) gradually decreases, while the value of dielectric constant ( ε r ) and temperature resonance frequency coefficient ( τ f ) gradually increase. For Li 2 Mg 3 SnO 6 -12 wt%BLCT ceramics, the best comprehensive performance of ε r  ∼ 12.0, Q × f  ∼ 10470 GHz, and τ f  ∼ −2.1 ppm/°C can be obtained. Which is expected to be an alternative material for communication component.