The effect of Pb²⁺substitution on the quantum paraelectric behaviour of CaTiO₃

Results of low temperature dielectric measurements on the mixed (Ca 1-x Pb x )TiO 3 system are presented to show that a dielectric anomaly appears for x≥0.10.The observed dielectric peak is shown to be due to a thermodynamic phase transition and not due to a relaxor or dipole glass type transition.Curie-Weiss fit to the dielectric constant gives negative Curie temperature which points towards an antiferroelectric transition.Arguments are advanced to propose that CaTiO 3 may be an incipient antiferroelectric in which Pb 2+ substitution stabilises the antiferroelectric phase.