Electrocaloric temperature changes in epitaxial Ba1−xSrxTiO3 films

Magalhaes B, Engelhardt S, Molin C, Gebhardt SE, Nielsch K, Huehne R (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Journal of Alloys and Compounds Elsevier

Book Volume: 891

Article Number: 162041

DOI: 10.1016/j.jallcom.2021.162041

Abstract

The basic aim of our study is to investigate the correlation between structural parameters and the electrocaloric effect in lead-free epitaxial Ba1−xSrxTiO3 (BSTO) based thin film architectures. Therefore, BSTO thin films with Sr contents of x = 0 to x = 0.3 were grown on SrRuO3 buffered SrTiO3 single crystalline substrates by pulsed laser deposition. Structural characterization verified an epitaxial growth for all Sr contents with an additional tetragonal distortion compared to bulk material. Temperature and frequency-dependent measurements of dielectric properties revealed increased permittivity values for thicker films with broad maxima indicating a diffuse phase transition. The temperature of maximum permittivity decreases with increasing Sr content, whereas polarization measurements indicate a relaxor-like behaviour in particular above room temperature. Adiabatic temperature changes were determined with the indirect method resulting in |ΔT| values of up to 2.9 K for a 680 nm thick BSTO layer with x = 0.3 at an applied electric field of 750 kV cm−1.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS) DE Germany (DE)

How to cite

APA:

Magalhaes, B., Engelhardt, S., Molin, C., Gebhardt, S.E., Nielsch, K., & Huehne, R. (2022). Electrocaloric temperature changes in epitaxial Ba1−xSrxTiO3 films. Journal of Alloys and Compounds, 891. https://doi.org/10.1016/j.jallcom.2021.162041

MLA:

Magalhaes, B., et al. "Electrocaloric temperature changes in epitaxial Ba1−xSrxTiO3 films." Journal of Alloys and Compounds 891 (2022).

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