Fabrication and microwave dielectric properties of the x(Ca0.8Na0.1Sm0.1)TiO3–(1 − x)(Sm0.5Nd0.5)AlO3 ceramic system

The x(Ca 0.8 Na 0.1 Sm 0.1 )TiO 3 –(1 − x)(Sm 0.5 Nd 0.5 )AlO 3 (CNST–SNA, 0.60 ≤ x ≤ 0.75) ceramic materials were prepared by a conventional two-step solid-state reaction route. The effects of the sintering temperature and composition on the phases, microstructures, and microwave dielectric properties were investigated. The optimal sintering temperature of the CNST–SNA ceramics was found at 1475 °C. The optimal microwave dielectric properties were achieved at x = 0.69 with ε r  = 43.8, Q ×  f  = 34303 GHz (at 5.968 GHz), and τ f  = − 1.64 ppm/°C.