Subsolidus phase relations in the Bi₄Ti₃O₁₂-Ag/Ag₂O-TiO₂ system

抄録

The subsolidus phase relations in the Bi₄Ti₃O₁₂-Ag/Ag₂O-TiO₂ system were determined by means of solid-state reaction, X-ray diffraction and scanning electron microscopy. The rutile and anatase phases showed different chemistries when reacting with the Ag/Ag₂O-Bi₂O₃, and the Ag_0.5Bi_8.5Ti₇O₂₇ phase can be obtained from the anatase form but not from the rutile form. In the present study the phase relations in the Bi-Ag-Ti-O system were established for the rutile form. The solid solutions TiO_2SS, Bi₄Ti₃O_12SS and Bi₂Ti₂O_7SS were identified in the Bi₄Ti₃O₁₂-Ag/Ag₂O-TiO₂ system and silver was found to be compatible with all three. There was no compatibility between the silver and the Bi₂Ti₄O₁₁. A single-phase compound was obtained for the pyrochlore phase Bi_1.55Ag_0.1Ti₂O_6.375.