SrLnAlO4 (Ln=Nd and Sm) microwave dielectric ceramics

Abstract

SrLnAlO4 (Ln=Nd and Sm) ceramics with K2NiF4 structure were prepared by a solid state reaction approach, and their microwave dielectric characteristics were evaluated together with the microstructures. The single phase dense SrNdAlO4 and SrSmAlO4 ceramics were obtained by sintering at 1450–1475°C and 1475–1500°C, respectively, and the good microwave dielectric characteristics were achieved: (1) e = 17.8, Q · f = 25,700 GHz, τ f = −9 ppm/°C for SrNdAlO4; and (2) e = 18.8, Q · f = 54,880 GHz, τ f = 2 ppm/°C for SrSmAlO4 dense ceramics. The Qf value significantly increased with increasing sintering temperature.