Microwave dielectric properties of Ba_(5-x)Sr_xTa_4O_(15), Ba_5Nb_xTa_(4-x)O_(15) and Sr_5NbxTa_(4-x)O_(15) ceramics

摘要

The Ba_(5-x)Ta_4Sr_xO_(15), Ba-5Nb_xTa_(4-x)O_(15) and Sr_5Nb_xTaO_(4-x)O_(15) microwave dielectric ceramics were prepared by the conventional solid-state ceramic route. The dielectric properties of the ceramics were measured in the microwave frequency region. The ceramics have high dielectric constant, high quality factor (Qxf up to 37 350 GHz) and temperature coefficient of resonant frequencies in the range — 60 to +78ppm/℃depending on the value of x. The solid solutions show intermediate microwave dielectric properties in between that of the end members except for Sr_5Nb_xTa_(4-x)O_(15) which showed a lower value of the dielectric constant.