Electrocaloric effect and energy storage in lead free Gd0.02Na0.5Bi0.48TiO3 ceramic

M. Zannen (1, 2) , A. Lahmar (1) , Z. Kutnjak (3) , J. Belhadi (1) , H. Khemakhem (2) , M. El Marssi (1)

1 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
2 FSS - Faculté des Sciences de Sfax
3 IJS - Jozef Stefan Institute [Ljubljana]

The electrocaloric effect (EC) was investigated in the ferroelectric lead-free Gd0.02Na0.5Bi0.48TiO3 (GdNBT) ceramics. A pure perovskite structure was observed by the X-ray diffraction in GdNBT ceramics synthesized by a solid-state reaction method. Dielectric measurements revealed the existence of different ferroelectric and antiferroelectric transformations in this material. Based on the temperature dependence of P-E loops, reversible electrocaloric temperature changes of about Delta T = 0.75 K at the electric field of 90 kV/cm and the EC responsivity Delta T/Delta E approximate to 0.08 x 10(-6) K m V-1 were obtained in the GdNBT ceramics. The energy-storage density W = 0.85 J cm(-3) and the associated efficiency (eta = 65%) at 413 K were determined from the P-E loops data. The simultaneous existence of EC responsivity and energy-storage density makes GdNBT very promising lead-free material and opens a great potential for its application in electronic devices. (C) 2017 Elsevier Masson SAS. All rights reserved.

Domaines: Matière Condensée [cond-mat]

M. Zannen, A. Lahmar, Z. Kutnjak, J. Belhadi, H. Khemakhem, et al.. Electrocaloric effect and energy storage in lead free Gd0.02Na0.5Bi0.48TiO3 ceramic. Solid State Sciences, 2017, 66, pp.31-37. ⟨10.1016/j.solidstatesciences.2017.02.007⟩. ⟨hal-03627580⟩