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The phase formation in the series Ln 2 Bi 3 FeTi 3 O 15  (Ln = La, Pr, Nd, Sm, Gd) was studied. It was found that the layered perovskite structure was formed after annealing at 1000 °C. Further increase in the synthesis temperature to 1100 °C did not affect the phase composition, excluding Gd-containing sample, where perovskite structure was partially destroyed to form the pyrochlore phase based on Bi 2 Ti 2 O 7 . Reversible anomalies obtained by differential thermal analysis indicate the phase transitions with a change in the crystal lattice symmetry in case of a perovskite-like phase and a transition of the order-disorder type in case of a pyrochlore structure.

Properties of lanthanide containing Aurivillius phases Ln 2 Bi 3 FeTi 3 O 15 (Ln = La, Pr, Nd, Sm, Gd)