TY  - JOUR
AU  - Zhang, Miaomiao
AU  - Liu, Laijun
AU  - Yang, Rusen
AU  - Yu, Ping
AU  - Zhang, Qi
AU  - Peng, Biaolin
PY  - 2022
TI  - Giant electrocaloric effect in BiFeO3 and La codoped PbZr0.7Ti0.3O3 epitaxial thin films in a broad temperature range
JO  - Journal of Materiomics
SN  - 2352-8478
SP  - 156
EP  - 165
VL  - 8
IS  - 1
AB  - Ferroelectric thin/thick films with large electrocaloric (EC) effect are critical for solid state cooling technologies. Here, large positive EC effects with two EC peaks in a broad temperature range (~100 K) were obtained in 0.95Pb0.92La0.08(Zr0.70Ti0.30)0.98O3-0.05BiFeO3 (BFOLa-codoped PZT) epitaxial thin films deposited on the (100), (110) and (111) oriented SrTiO3 (STO) substrates by a sol-gel method. The thin film deposited on the (111) oriented STO substrate exhibited a stronger EC effect (~20.6 K at 1956 kV/cm) near room temperature. However, the thin films deposited on the (100) and (110) oriented STO substrates exhibited a stronger EC effect (~18.8 K at 1852 kV/cm and ~20.8 K at 1230 kV/cm, respectively) around the peak of the dielectric permittivity (Tm, ~375 K). Particularly, as the direction of the applied electric field was switched (E < 0), the ΔT of the (100)-oriented thin films around Tm was enhanced significantly from 18.8 K to 38.1 K. The self-induced-poling during the preparing process maybe plays a key role on the magic phenomenon. It can be concluded that the BFOLa-codoped PZT epitaxial thin films are promising candidates for application in the next solid-state cooling devices.
UR  - https://doi.org/10.1016/j.jmat.2021.04.007
DO  - 10.1016/j.jmat.2021.04.007