SKM 2023 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.39: Poster
Tuesday, March 28, 2023, 17:00–19:00, P3
Investigation of ferroelectricity in BaTiO3-relaxors by PFM — •Philipp Münzer1, Markus Kratzer1, Christian Maier3, Klaus Reichmann3, Marco Deluca2, and Christian Teichert1 — 1Institute of Physics, Montanuniversität Leoben, Leoben, Austria
— 2Materials Center Leoben, Leoben, Austria
— 3Institute for Chemistry and Technology of Materials, Graz, Austria
BaTiO3 relaxor systems are promising materials for energy storage applications in microelectronic devices. These lead-free dielectrics are thermally stable and suitable for high-temperature operation due to their broad and high permittivity response and low electric coercivity. The relaxor behaviour can be achieved by homo- or heterovalent substitution of Ti4+ ions in the perovskite cell, which disrupts the long-range ferroelectric order. We investigated the presence of ferroelectricity in homovalent (Zr4+) and heterovalent (Nb5+) substituted polycrystalline BaTiO3 systems utilizing Piezoresponse Force Microscopy (PFM). We used Single-Frequency-PFM to image the domain structure of the relaxors and conducted polarization switching with a biased tip. Furthermore, local hysteresis loops were recorded utilizing Switching-Spectroscopy-PFM. The results indicate that the grade of ferroelectric disruption is strongly dependent on the amount and type of substitutes.