Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 27: Postersession KFM

KFM 27.8: Poster

Donnerstag, 15. März 2018, 15:00–17:00, Poster E

Direct measurements of electrocaloric effect in Barium Titanate single crystals — •Maksim O. Karabasov, Mehmet Sanlialp, Vladimir V. Shvartsman, and Doru C. Lupascu — Institute for Materials Science, University of Duisburg-Essen, 45141 Essen, Germany

The electrocaloric effect (ECE) is studied for barium titanate single crystals utilizing two direct measurement methods. The adiabatic electrocaloric temperature change is observed by applying an electric field to the barium titanate single crystals in a quasi-adiabatic calorimeter. The second method uses the enthalpy change in a modified differential scanning calorimeter (DSC) to calculate the electrocaloric temperature change [1]. The focus of this study is to examine the anisotropy of ECE by applying electric fields for [001], [011] and [111] oriented single crystals. The anisotropy of the ECE leads to a possible negative temperature change, i.e. a temperature decrease by application of an electric field during the orthorhombic-tetragonal phase transition of Barium Titanate, if the field orientation favors the higher temperature/entropy phase [2].

[1] M. Sanlialp et al., Appl. Phys. Lett. 111, 173903 (2017)

[2] M. Marathe et al., Phys. Rev. B 96, 014102 (2017)