Preparation, structure, and dielectric and magnetic properties of SrFe$_{2/3}$W$_{1/3}$O$_{3}$ ceramics

Polycrystalline samples of SrFe$_{2/3}$W$_{1/3}$O$_{3}$ (SFWO) ceramic were obtained by solid-phase reactions with subsequent sintering using conventional ceramic technology. X-ray diffraction analysis showed that at room temperature, the SFWO ceramic is single-phase and has a perovskite-type structure with tetragonal symmetry and parameters $a$ = 3.941(9) $\mathring{\mathrm{A}}$, $c$ = 3.955(6) $\mathring{\mathrm{A}}$, and $c/a$ = 1.0035. In studying the magnetic properties and the Mössbauer effect in SFWO ceramics, it is found that the material is a ferrimagnet, and the iron ions are only in the valence state of Fe$^{3+}$. It is suggested that in the temperature range of $T$ = 150–210$^{\circ}$C, a smeared phase transition from a cubic (paraelectric) phase to a tetragonal (ferroelectric) phase takes place in SFWO with decreasing temperature.