Mechanism and Kinetics of Formation of Solid Solutions in the Nd2SrAl2O7–Ho2SrAl2O7 System

The processes of phase formation in the Nd2O3–Ho2O3–SrO–Al2O3 system are investigated in the temperature range 1100–1530°C. It is revealed that the structural–chemical mechanism of formation of (Nd x Ho1 – x)2SrAl2O7 solid solutions depends on the temperature and composition. An increase in the holmium content and in the temperature leads to a crossover from the mechanism including the formation of LnAlO3 and LnSrAlO4 as intermediate products to the mechanism in which the interaction of Ln2O3 and SrAl2O4 is a limiting stage.