Equilibrium phases in the Bi_2O_3-TiO_2-WQ_3 system

摘要

Phase relations in the Bi_2O_3-TiO_2-WO_3 ternary system were evaluated for different compositions calcined in air at 850 deg C by means of XRD techniques. A solid solution area was observed for Bi_4Ti_3O_(12) compositions with a small amount of WO_3. The experimental results suggest the existence of a new phase with a nominal composition close to Bi3Ti2.5W0.5Ou. This phase allows the definition of four triangles of compatibility at 850 deg C in the ternary system. The new phase was characterized by XRD, SEM and EDS.