A5B4O15 (A=Ba, Sr, Mg, Ca, Zn; B=Nb, Ta) microwave dielectric ceramics

Abstract The microwave dielectric properties of A5B4O15 (A=Ba, Sr, Mg, Ca, Zn; B=Nb, Ta) ceramics are investigated. The ceramics are prepared through the solid-state ceramic route. The dielectric properties are studied at microwave frequencies and structure and microstructure by XRD and scanning electron micrograph (SEM) methods. The ceramics show er in the range 11–51, Q×f is in the range 2400–88,000 GHz and τf in the range −73–232 ppm/°C.