Structural phase transitions in the Bi1− x La x FeO3 system

The crystal structure and phase composition of the Bi_1−x La _x FeO₃ system have been studied by the methods of neutron and x-ray diffractions and electron microscopy. It has been revealed that a unit cell of the solid solutions at room temperature is described by the R3c, Imma, and Pnma space groups in the concentration ranges 0 < x < 0.19, 0.4 < x < 0.5, and x > 0.5, respectively. For 0.2 < x < 0.4, the solid solutions are not formed.