Solid solutions of perovskite in the LaO1.5-BaO-ScO1.5-ZrO2 system at 1600 deg. C

A partial pseudoternary phase diagram of the LaO1.5-BaO-ScO1.5 system was established at 1600 deg. C. According to the phase diagram, the solubility of barium into the cubic perovskite phase (LaScO3) at 1600 deg. C is 0.24 in a mole fraction of barium oxide (XBaO) on the composition line where the mole fraction of scandium oxide is 0.50. Another cubic perovskite phase (BaZrO3) in the BaO-ZrO2-ScO1.5 system is also known. We investigated the phase relationships between the two cubic perovskites in the pseudoquaternary phase diagram of the LaO1.5-BaO-ScO1.5-ZrO2 system. As a result, we found the existence of a wide solid solution region between the cubic perovskites at 1600 deg. C. The region was determined by X-ray diffraction (XRD) analysis and energy dispersive X-ray (EDX) microanalysis of samples with various compositions, and established the partial pseudoquaternary phase diagram. - Graphical abstract: The phase boundary of solid solution between lanthanum scandate and barium zirconate at 1600 deg. C was clarified by establishing a partial pseudoquaternary phase diagram of the LaO1.5-BaO-ScO1.5-ZrO2 system at 1600 deg. C