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New Phase Transition in Layered Ferroelectric Pb2Bi4Ti5O18

A new phase transition was found in Bi-layered perovskite Pb2Bi4Ti5O18 with m = 5 by dielectric and thermal measurements at T1 = 480 K, in addition to the previously reported ferroelectric phase transition at 603 K (T c). The dielectric and thermal anomalies are diffuse and broad around T c, while rather clear at T1. The dielectric behavior is quite different from the Curie-Weiss behavior observed in typical perovskite ferroelectrics, while these properties are common in Bi-layered ferroelectrics. Pb2Bi4Ti5O18 undergoes a ferroelectric phase transition via new intermediate phase. The transition temperatures show linear dependence on the ionic radii of A ion in Bi-layered perovskite A2Bi4Ti5O18.