Equilibrium phases in the Bi2O3–TiO2–WO3 system

Phase relations in the Bi2O3–TiO2–WO3 ternary system were evaluated for different compositions calcined in air at 850 °C by means of XRD techniques. A solid solution area was observed for Bi4Ti3O12 compositions with a small amount of WO3. The experimental results suggest the existence of a new phase with a nominal composition close to Bi3Ti2.5W0.5O11. This phase allows the definition of four triangles of compatibility at 850 °C in the ternary system. The new phase was characterized by XRD, SEM and EDS.