Giant Electrocaloric Effect in Thin‐Film PbZr_0.95Ti_0.05O₃.

Abstract

Thermal properties D 3000 Giant Electrocaloric Effect in Thin-Film PbZr 0.95 Ti 0.05 O 3 . -Thin films of the title compound (350 nm) exhibit a giant electrocaloric effect of 0.48 K/V at 226°C near the ferroelectric Curie temperature (222°C) exceeding the previously best results obtained in bulk Pb0.99Nb0.02(Zr0.75Sn0.20Ti0.05)0.98O3 (0.003 K/V at 162°C). A large electrocaloric effect may find application in electrical refrigeration and could provide cooling solutions for electronic components such as computer chips. -(MISCHENKO*, A. S.; ZHANG, Q.; SCOTT, J. F.; WHATMORE, R. W.; MATHUR, N. D.; Sci.

Modeling of hysteresis loop and its applications in ferroelectric materials

“…[33], the dashed line is a fourth-polynomial method result and the single line represent simulated data using this model. It is found that, the maximum of temperature change ( T  ) is much lower than that reported in work [33], but close to the one reported in Science where a fourth-polynomial was used [31]. In addition, the corresponding maximum of temperature change ( T  ) in our work are near the experiment result, i.e.…”

“…Usually, when ) (E P hysteresis loops were measured under several selected temperatures, the ) (T P data at selected applied field could be extracted and then the value of ) / ( T P   can be obtained from P versus T by fitting a fourth order polynomial to the data from the upper branches of hysteresis loops [31]. Based on the Maxwell relation, the isothermal entropy change ΔS due to an applied or removal of an electric field is given by:…”

“…In the literature, Mischenko ever proposed a fourth polynomial method and used in the year of 2006 [31] and Hamad reported a phenomenological model in 2012 [32]. In this article, we proceed from our proposed model to calculate the electrocaloric effect of Pb(Zr0.95Ti0.05)O3 films.…”

Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film

“…We have previously demonstrated that a giant ECE could be obtained for thin films because it is possible to apply a higher E. 14,16 ⌬T max = 12 K for PZT thin films near T C = 226°C, 14 and ⌬T max = 5 K for 0.9PMN-0.1PT thin films near 60°C, 16 were determined by indirect measurements using Eq. ͑1͒.…”

“…18͒ were subsequently found to show ⌬T max = 12 and 4.9 K near T C , respectively, and the entropy ͑and energy͒ changes per cycle in the polymer could be up to five times larger than for PZT. 14 Although progress has therefore been reported in achieving the ECEs at lower operating temperatures, 17 the large 12°C effects 14,17 have not previously been demonstrated at or very near room temperature.…”