High energy and power density achieved in Pb_0.94La_0.04HfO₃antiferroelectric ceramics with multiple phase transition

Antiferroelectrics (AFEs) with high energy density and fast discharge speed are greatly needed to improve the performance of capacitors. In the present work, La-doped PbHfO3 ceramics were fabricated and the antiferroelectricity was investigated. The complicated phase transition behavior at both high electric field and rising temperature in composition Pb0.94La0.04HfO3 was revealed. Multiple phase transition was observed at high field, and when rising the temperature to 110 °C, an intermediate phase transition to another AFE phase was observed. The Pb0.94La0.04HfO3 ceramics have a high recoverable energy density of 10.2 J/cm3 and efficiency of 81.7%. Double P-E loop could be observed even at 180 °C, ensuring the high energy density at high temperature. In addition, a high current density of 2109 A/cm2 and a power density of 369 MW/cm3 could be obtained. This work revealed the antiferroelectricity in La-doped PbHfO3 ceramics and proved their potential for high energy and power density applications.