Impact of annealing on electrocaloric response in Lanthanum-modified lead zirconate titanate ceramic

B. Asbani (1) , Jean-Luc Dellis (1) , Abdel-Ilah Lahmar (1) , M. Amjoud (2) , Y. Gagou (1) , D. Mezzane (2) , Z. Kutnjak (3) , R. Pirc , M. El Marssi (1) , I Luk'Yanchuk (1) , B. Rozic

1 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
2 LMCN - Laboratoire de Matière Condensée et Nanostructures
3 IJS - Jozef Stefan Institute [Ljubljana]

Over the past decades, there has been significant interest in new cooling technology based on the large electrocaloric effect observed in polymeric and inorganic ferroelectric materials. We report a dramatic impact of annealing on the electrocaloric effect observed by direct measurements in Pb0.88La0.12(Zr0.65Ti0.35)(0.97)O-3 bulk ceramics (12/65/35 PLZT). In addition, the EC response was measured deep in a relaxor part of the PLZT composition phase diagram. After additional one-hour sample annealing at 600 degrees C, the EC response increased by about six times. Electrocaloric results confirm the existence of the significant electrocaloric response with the EC temperature change (Delta T-EC) of 4.5 K at 360 K and 90 kV/cm in an annealed sample. This value exceeds previously obtained maximum Delta T-EC values at the same field in perovskite relaxor ferroelectrics such as Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT) and 8/65/35 PLZT ceramics. The electrocaloric responsivity Delta T/Delta E = 5.09 x 10(-7) Km/V determined at 360 K is among the highest ob-served in bulk perovskite ferroelectrics at a relatively high electric field of 90 kV/cm. (C) 2022 The Author(s). Published by Elsevier B.V.

Domaines: Matière Condensée [cond-mat]

B. Asbani, Jean-Luc Dellis, Abdel-Ilah Lahmar, M. Amjoud, Y. Gagou, et al.. Impact of annealing on electrocaloric response in Lanthanum-modified lead zirconate titanate ceramic. Journal of Alloys and Compounds, 2022, 907, ⟨10.1016/j.jallcom.2022.164517⟩. ⟨hal-03703577⟩