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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 94: TEM-based Nanoanalysis and Microstructure of thin films (joint session KFM/CPP)
CPP 94.4: Vortrag
Donnerstag, 19. März 2020, 15:20–15:40, HSZ 301
Ferroelectric and structural properties of epitaxial NaxBi1-xTiO3 and BaxSr1-xTiO3 based thin films for electrocaloric studies — •Bruno Magalhaes1,2, Stefan Engelhardt1,2, Christian Molin3, Sylvia Gebhardt3, Kornelius Nielsch1,2, and Ruben Hühne1 — 1IFW Dresden, Institute for Metallic Materials, Dresden, Germany — 2Institute of Material Science, TU Dresden, Dresden, Germany — 3Fraunhofer IKTS, Fraunhofer Institute for Ceramic Technologies and Systems, Winterbergstraße 28, D-01277 Dresden, Germany
The purpose of our study is to investigate the electrocaloric effect in lead-free epitaxial NaxBi1-xTiO3 (NBT) and BaxSr1-xTiO3 (BST) based thin films. We are focusing on microstructural changes to identify the basic mechanisms of the caloric effects, which might enable a further optimization. Our aim is to investigate the influence of the deposition parameters as well as the functional properties in these material systems. Therefore, NBT and BST based thin films were grown on different single crystalline substrates by pulsed laser deposition. The structural characterization verifies an epitaxial growth of both materials with an additional tetragonal distortion. Temperature and frequency dependent measurements of the dielectric properties as well as polarization were used to determine the temperature of maximum permittivity and the ferroelectric properties, respectively. Finally, we will discuss the impact of the deposition parameters on the structural and functional properties of the grown films. This work is supported by the DFG priority program 1599 Ferroic cooling.