Ca4La2Ti5O17: a novel low loss dielectric ceramics in the CaO–La2O3–TiO2 system

A novel low loss dielectric material Ca4La2Ti5O17 was prepared by solid state ceramic route. The structure and microstructure of the Ca4La2Ti5O17 ceramics was investigated using XRD, SEM and EDX techniques. XRD result showed cubic perovskite like structure for Ca4La2Ti5O17 ceramics. The ceramics were sintered in the temperature range of 1,450–1575 °C. The microwave dielectric properties of the material were investigated using a network analyzer in the frequency range of 3–6 GHz. The variation in microwave dielectric properties of the Ca4La2Ti5O17 ceramics with sintering temperature was correlated with bulk density of the material. Ca4La2Ti5O17 has εr of 73, Quxf of 16,000 at 3.3 GHz, and τf of 127 ppm/°C at the optimized sintering temperature of 1,550 °C/4h.