Sintering behavior, phase evolution and microwave dielectric properties of Bi{Sb_1-x(Nb_0.992V_0.008)_x}O₄ ceramics

Bi{Sb_1-x(Nb_0.992V_0.008)_x}O₄ compositions were designed with 0.05 ≤ x ≤ 0.4 and ceramics were prepared using solid state reaction method. All ceramics were well densified when sintering temperature was above 960 °C. Single monoclinic phase was obtained when x value was less than 0.2 and Bi{Sb_0.6(Nb_0.992V_0.008)_0.4}O₄ ceramic was composed of both monoclinic phase and orthorhombic phase. As x value increased from 0.05 to 0.2, microwave dielectric constant of Bi{Sb_1-x(Nb_0.992V_0.008)_x}O₄ ceramics increased from 22.1 to 31.4 while Q_f value decreasing from 41000 GHz to 8000 GHz and TCF shifting from -54.4 ppm °C^-1 to +8 ppm °C^-1. Bi{Sb_0.6(Nb_0.992V_0.008)_0.4}O₄ ceramic has also good microwave dielectric properties with dielectric constant about 34.7, Q_f value about 16000 GHz and TCF about +16.1 ppm °C^-1. This kind of ceramics might be a good candidate for LTCC application.