Composition-induced structural phase transitions in the (Ba1−xLax)2In2O5+x (0⩽x⩽0.6) system

Strain behaviour at room temperature of (Ba1−xLax)2In2O5+x solid solutions. Variations of the orthorhombic, eo (crossed circle), and tetragonal, et (star), shear strains and the volume strain, ea (diamond (empty when one of the seven samples annealed for 2 days at 1400 °C)), with respect to a cubic structure, as a function of composition. Vertical lines represent the approximate points of transitions.