Dresden 2026 – scientific programme

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FM: Fachverband Funktionsmaterialien

FM 11: Poster Session Functional Materials

FM 11.32: Poster

Tuesday, March 10, 2026, 18:00–20:30, P4

Correlation between grain size and dielectric properties in medium entropy titanate-based perovskite oxides — Amirhosein Paryab, •Doru Lupascu, and Vladimir Shvartsman — Institut für Materialwissenschaft Universität Duisburg-Essen Essen, Germany

High-entropy perovskite oxides have attracted significant attention as promising materials for energy storage applications. The configurational entropy is modulated by substituting different elements at a specific ionic site. If it is in the range of 0.7R-1.6R or above 1.6R, the oxides are called medium-entropy or high-entropy, respectively. We report a study of the influence of the synthesis method on the structure, dielectric, and ferroelectric properties of medium entropy titanate-based perovskite oxides (Ba0.34Sr0.33Ca0.33)TiO3 and (Ba0.25Sr0.25Ca0.25Pb0.25)TiO3. Compared to the solid state method, the sol-gel derived materials have a smaller grain size and higher lattice strain. This results in a more diffuse phase transition and a significant shift in the Curie temperature by 60 and 10 K in (Ba0.34Sr0.33Ca0.33)TiO3 and (Ba0.25Sr0.25Ca0.25Pb0.25)TiO3, respectively. Furthermore, fine grained samples were found to exhibit broader polarization hysteresis loops that could be ascribed to higher barriers to dipole switching and the pinning effect. The interplay of configuration entropy, microstructure, and functional behavior is analyzed.

Keywords: medium-entropy; titanates; perovskite