Structure, Intrinsic properties and Vibrational Spectra of Pr(Mg 1/2 Sn 1/2 )O 3 Ceramic Crystal.

Pr(Mg _1/2 Sn _1/2 )O ₃ (PMS) ceramic was prepared through a conventional solid-state reaction method. Crystal structure was investigated through X-ray diffraction (XRD), which certificates that the main phase is PMS with monoclinic P2 ₁ /n1 symmetry. Lattice vibrational modes were obtained through Raman scattering spectroscopy and Fourier transform far-infrared reflection spectroscopy. The Raman spectrum active modes were assigned and illustrated, respectively, and then fitted with Lorentzian function. The four modes within the range of 110-200 cm ^-1 are derived from the F _2g vibrations (A-site cations), and the other three modes (300-430 cm ^-1 ) are derived from the F _2g vibrations (B-site cations).The mode with highest frequency above 650 cm ^-1 is attributed to A _1g -like mode that corresponds to the symmetric breathing of oxygen octahedral. The far-infrared spectrum with seven infrared active modes was fitted using four-parameter semi-quantum models to calculate intrinsic properties (permittivity and loss). F _2u ⁽²⁾ yielded the greatest contribution to dielectric constant and loss, which is mainly performed as the inverted translational vibration of Pr-MgO ₆ octahedron.