Solid state phase formation in the Bi2O3-PbO-CaO system

Following our previous research, this work is dedicated to the study of pha se formation in the subsolidus domain of the Bi2O3-PbO-CaO system. Former investigations performed by DTA/TGA and XRD have pointed out that un der non-isothermal conditions only the formation of binary compounds occurs . Under such conditions these compounds could be non-equilibrium phases. In order to establish the conditions of formation of equilibrium phases, a study of the Bi2O3-PbO-CaO system, in isothermal conditions, was carried ou t. The results obtained in isothermal conditions have confirmed the presenc e of Bi2O3-rich solid solutions and Ca2PbO4 as main equilibrium phases. An attempt to represent the phase relations of the mentioned system at 700 deg rees C should be equally mentioned.