Enhanced temperature stability of Mg2TiO4-based ceramics by LCB additive.

The Mg 2 TiO 4 - x wt% LiF–2CaF 2 –2B 2 O 3 (LCB, 3.0 ≤ x ≤ 10.0) ceramics were fabricated to study the relationship among LCB additive and the sintering behavior, phase composition, micro-structure and dielectric performance of ceramics in this study. The sintered ceramics are mainly Mg 2 TiO 4 phase, accompanied by small amount of second phase CaTiO 3 and Mg 3 B 2 O 6. They are generated from the chemical reaction of CaF 2 and B 2 O 3 with the matrix material, respectively. Appropriate LCB additive significantly enhanced sintering ability and dielectric performance of Mg 2 TiO 4 -based ceramics. Sintered at 1175 °C, Mg 2 TiO 4 -7.5 wt% LCB ceramics exhibited a dielectric performance: ε r of 15.3, Q × f of 32 950 GHz and τ f of +1.96 ppm/°C, which is expected to be an alternative material for communication component. [ABSTRACT FROM AUTHOR]