Berlin 2015 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 13: Ceramics and Applications (DF with KR)
DF 13.3: Talk
Wednesday, March 18, 2015, 12:10–12:30, EB 407
Tuning structure in epitaxial Pb(Mg1/3Nb2/3)O3-PbTiO3 thin films for ferroelectric applications by using miscut substrates — •Michael Mietschke1,2, Max Hößler1,3, Stefan Engelhardt1,2, Sebastian Fähler1,2, Ludwig Schultz1,2, and Ruben Hühne1 — 1IFW Dresden — 2TU Dresden — 3TU Chemnitz
Ferroelectric materials like lead magnesium niobate - lead titanate (PMN-PT) show a large electrocaloric effect induced by an electrical field during a diffusionless phase transition, which can be used for novel solid state cooling devices. However, the interplay between the microstructure and the ferroelectric properties is not completely understood so far.
Therefore, epitaxial 1-x Pb(Mg1/3Nb2/3)O3- xPbTiO3 films were grown by pulsed laser deposition on (001)-oriented single crystalline SrTiO3 (STO) substrates with a miscut angle between 0 and 15 degrees towards the [100] direction. The structural properties in dependence from the miscut angle and the deposition parameters are studied by detailed x-ray diffraction, atomic force microscopy and transmission electron microscopy. Temperature dependent ferroelectric characterization was performed by using La0.7Sr0.3Co3 buffer layers and additional Pt top electrodes on the surface of the PMN-PT layer. Normal ferroelectric as well as relaxor ferroelectric behavior was found in dependence of the PT content. First attempt were made to determine the electrocaloric properties from the temperature dependent polarization curves.