Synthesis, crystal structure, Mössbauer spectra and dielectric property of La_1-xSr_xFe_1-xTi_xO₃ (x = 0, 0.1, 0.3, 0.5, 0.7, 1)

La_1-xSr_xFe_1-xTi_xO₃ (x = 0, 0.1, 0.3, 0.5, 0.7, 1) are synthesized by a wet chemical method. The crystal structure of the compounds belongs to orthorhombic system when x < 0.5 and to cubic system when x ≥ 0.5. Mössbauer spectra of the ⁵⁷Fe nucleus demonstrate that the iron ion in the compounds is trivalent and in high spin state and the distribution of Fe ion at the B site in the lattice of La_1-xSr_xFe_1-xTi_xO₃ is random. The orthorhombic compound is magnetic and the cubic compound is paramagnetic. The frequency dependence of the dielectric loss of the orthorhombic compound in the region from 10 kHz to 1 MHz is very different from that of the cubic compound.