“…From the cla tendency to the decrease at T > 1020 cm-2 one can expect the radiation induced phase transition in PbTi03 at q, c > 2 x 102° cm-2. Corresponding values of q, c for BaTi03 (N 5 x 1018 cm-2 [3], [4], [7]), PbZrO3 (N 2 x 1019 cm-2 [7]) and PbTi03 (> 2 x 102° cm -2) are in agreement with the differences of their Curie points (1200C, 230 °C and 490 °C respectively). This fact is in favour of the validity of our statement concerning the character of radiation induced phase transformations in perovskite type compounds [3], [4].…”