IMF2017

Some Bi-based ceramics have been recently extensively studied due to their interesting ferroelectric, magnetic and multiferroic properties. In the present investigation a subsolidus high-temperature phase relations in air were determined in the systems: (1) Bi₂O₃-Mn₂O₃-Fe₂O₃, (2) Bi₂O₃-Mn₂O₃-Al₂O₃ and (3) Bi₂O₃-Mn₂O₃-Ga₂O₃. The samples were prepared by wet method from nitrates and/or acetate in order to obtain well homogenized starting powder, which were additionally fired at temperatures 760-790 ^oC until equilibrium was reached. Based on the X-ray powder diffraction data, relevant phase diagrams were constructed. Sillenite-like phases in all three systems form solid solution in entire compositional range, however, perovskite-related compounds Bi₂M1₄O_9+δ (M1 = Mn, Fe, Al, Ga) form solid solutions in limited range, and their extension depends on the system. Solid solubility regions and structural properties of the solid solutions were determined with detailed XRD analysis.