Relationship between microstructure and microwave dielectric properties of glass-free low temperature co-fired CaLa2(MoO4)4 ceramic

CaLa2(MoO4)(4) ceramic material with a tetragonal scheelite structure was fabricated via a traditional solid-state reaction method. The CaLa2(MoO4)(4) belongs to the tetragonal system of I4(1)/a space group. Dense CaLa2(MoO4)(4) ceramic can be formed at the optimal sintering temperature of 950 degrees C, and the sample exhibits good microwave dielectric properties of epsilon(r) = 10.52, Qf = 37,497 GHz, tau(f) = -58 ppm/degrees C. The change of er can be attributed to the density and Raman shift of ceramics, while the tf value can be attributed to the change of bond valence caused by the distribution of different ions at the A site. Raman spectroscopy reveals the correlation between microwave dielectric properties and lattice vibration of CaLa2(MoO4)(4) ceramic. In addition, the compatibility between CaLa2(MoO4)(4) ceramics and Ag was evaluated. These results indicate that CaLa2(MoO4)(4) ceramics have broad prospects in LTCC applications.