Temperature stable (1-x)NaCa4V5O17-xBaV2O6 microwave dielectric ceramics for ULTCC applications

Novel temperature stable (1-x)NaCa4V5O17-xBaV2O6 (0.8≤x≤0.9, (1-x)NCV-xBV) ceramics were successfully synthesized through a high-temperature solid phase reaction route. XRD and SEM-EDS analysis demonstrated that only NaCa4V5O17 and BaV2O6 phases were formed without any extra phase. The introduction of BaV2O6 not only effectively improved the τf of NaCa4V5O17 matrix but also considerably lowered its sintering temperature to 550 °C. Typically, an approximate-zero τf value around −1.0 ppm/°C was achieved for 550 °C sintered 0.12NCV-0.88BV ceramics with low εr of 10.9 and Qxf of 15,500 GHz (at 10.3 GHz). Its good compatibility with Al electrode furthermore made 0.12NCV-0.88BV composites suitable for ULTCC applications.