Microwave dielectric properties of Ca[(Li1/3Nb2/3)1−xTi3x]O3−δ ceramics with B2O3

Microwave dielectric properties of Ca[(Li1/3Nb2/3)1−x Ti3x] O3−δ (0.0≤x≤0.2) (CLNT) ceramics with B2O3 were investigated. In the entire composition range, the orthorhombic single phase was detected. With increase of x from 0.0 to 0.2, dielectric constant (K) increased from 30 to 89, Q·f value decreased from 33,000 to 3820 GHz, and temperature coefficient of resonant frequencies (TCF) increased from −16 to 22.4 ppm °C−1, respectively. Furthermore, with addition of 1.0 wt.% B2O3, the sintering temperature of CLNT ceramics was reduced from 1150 to 970 °C without degradation of dielectric properties. Typically, K=50, Q·f=6500 GHz, and TCF=−7.6 ppm °C−1 were obtained for the with CLNT (x=0.1) specimen with 1.0 wt.% B2O3 sintered at 940 °C, which is promising for application of multilayer microwave devices using Ag as internal electrode.