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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 3: Focus Session: (Multi-)Ferroic States I

KFM 3.6: Vortrag

Montag, 18. März 2024, 11:10–11:30, EMH 225

Influence of ferroelectric domain structures on thermal conductivity in ErMnO3 ceramics — Rachid Belrhiti Nejjar¹, Manuel Zahn², Fabien Giovannelli¹, Max Haas², Jan Schultheiß², Dennis Meier², and •Guillaume F. Nataf¹ — ¹GREMAN UMR7347, CNRS, University of Tours, INSA Centre Val de Loire, 37000 Tours, France — ²NTNU Norwegian University of Science and Technology, Høgskoleringen 1, Trondheim 7034, Norway

Domain walls in ferroelectric and ferroelastic materials interact with phonons conducting heat and are thus interesting tools to tune thermal conductivity [1]. Recent results show that ferroelectric domain walls in single crystals of ErMnO3 reduce thermal conductivity [2]. To reveal the full potential of domain walls for thermal applications, it is required to demonstrate their influence on thermal conductivity in ceramics, where grain sizes and grain boundaries can also play a role. Here, we investigated the thermal conductivity of several ceramics of ErMnO3 with different grain sizes and different densities of domain walls. Different domain sizes were obtained by crossing the Curie temperature with different cooling rates. Different grain sizes result from different sintering temperatures [3]. Our measurements performed with a laser flash system between 160 K and 360 K demonstrate a correlation between the thermal conductivity and the domain structure in ceramics of ErMnO3, including at and above room temperature.

[1] Limelette et al. Phys. Rev. B 108, 144104 (2023) [2] Pang et al. Mater. Today Phys. 307, 100972 (2023) [3] Schultheiß et al. Adv. Mater. 34, 2203449 (2022)

Keywords: ferroelectricity; domain walls; thermal conductivity; ceramics