Lattice vibrational characteristics, crystal structure, and dielectric properties of single-phase Sr(Mg1/2Mo1/2)O3 microwave dielectric ceramic

Sr(Mg1/2Mo1/2)O3 (SMM) microwave dielectric ceramic was prepared by a solid-state sintering method. X-ray diffraction shows that the sample is a single-phase SMM with a tetragonal double perovskite structure (Fm-3m). Raman scattering and FTIR spectroscopy analyze the vibration characteristics of lattice. The far-infrared spectra of SMM ceramics fitted by a FPSQ model are obtained, εr = 7.39 and tanδ = 8.19 × 10–4. The theoretical properties calculated by the C-M and damping equations are of εr = 7.03 and tanδ = 6.19 × 10–4, which agrees well with the experimental values (εr = 7.84 and tanδ = 6.59 × 10–4). The results show that the stretching vibration of Mg/MoO6 has the greatest influence on the dielectric properties of the SMM sample.