Structure and microwave dielectric properties of (Ca0.9375Sr0.0625)0.25 (Li0.5Sm0.5)0.75TiO3 ceramics with B2O3-CuO sintering aids

The B2O3-CuO oxide mixture (abbreviated as BC) was selected to lower the sintering temperature of (Ca0.9375Sr0.0625)(0.25)(Li0.5Sm0.5)(0.75)TiO3 (abbreviated as CSLST) microwave dielectric ceramics by solid sate reaction technique. The effects of BC doping amounts on the crystal structure, microstructure and microwave dielectric properties of the ceramics were investigated. For the ceramic sample with the composition of CSLST + 5 wt% BC, its sintering temperature was reduced to 1000 degrees C as compared to 1200 degrees C for mire CSLST. In addition to the obtained good microwave dielectric properties as follows: epsilon(r) = 80.4, Qxf = 1380 GHz, tau(f) = -32.89 x10(-6)/degrees C, this ceramic was a desirable high-permittivity microwave dielectric candidate for low-temperature cofired ceramic (LTCC) applications.