Anisotropic dislocation-domain wall interactions in ferroelectrics

Autor: Fangping Zhuo, Xiandong Zhou, Shuang Gao, Marion Höfling, Felix Dietrich, Pedro B. Groszewicz, Lovro Fulanović, Patrick Breckner, Andreas Wohninsland, Bai-Xiang Xu, Hans-Joachim Kleebe, Xiaoli Tan, Jurij Koruza, Dragan Damjanovic, Jürgen Rödel

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-11 (2022)

Dislocations are often perceived as a culprit for degradation in functionality. Here, the authors introduce a general framework for engineering dislocations and domain walls and demonstrate its full potential on a ferroelectric BaTiO3 single crystal.

Externí odkaz: https://doaj.org/article/7f2aba9a6d7b46d5912b9a22a2e20d3b

Quantitative mapping of nanotwin variants in the bulk

Autor: Phil Cook, Hugh Simons, Jürgen Rödel, Lukas Porz, Marion Höfling, Can Yildirim, Semën Gorfman, Jan Schultheiß, Carsten Detlefs, Lalitha Kodumudi Venkataraman

Publikováno v: Schultheiß, J, Porz, L, Kodumudi Venkataraman, L, Höfling, M, Yildirim, C, Cook, P, Detlefs, C, Gorfman, S, Rödel, J & Simons, H 2021, ' Quantitative mapping of nanotwin variants in the bulk ', Scripta Materialia, vol. 199, 113878 . https://doi.org/10.1016/j.scriptamat.2021.113878
Scripta Materialia
'Scripta Materialia ', vol: 199, pages: 113878-1-113878-5 (2021)

Crystallographic twins are critical to the properties of numerous materials from magnesium alloys to piezoelectrics. Since the onset of the twin formation is highly sensitive to the triaxial mechanical boundary conditions, non-destructive bulk micros

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d4d57b4f2ce97ff4d5cbc47b07ed983
http://tuprints.ulb.tu-darmstadt.de/23202/

Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO3

Autor: Lukas Porz, Michael Scherer, Marion Höfling, Atsutomo Nakamura, Wolfgang Rheinheimer, Jürgen Rödel

Publikováno v: Porz, L, Scherer, M, Höfling, M, Nakamura, A, Rheinheimer, W & Rödel, J 2023, ' Dislocation-based high-temperature plasticity of polycrystalline perovskite SrTiO 3 ', Journal of Materials Science, vol. 58, no. 6, pp. 2430-2438 . https://doi.org/10.1007/s10853-022-07405-3

Dislocation networks have been demonstrated to substantially enhance functional properties. As-sintered samples are virtually devoid of dislocations, new innovative techniques for introducing sufficiently high dislocation densities into polycrystalli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0617dea0240d5774a7fdb73800b81576
https://orbit.dtu.dk/en/publications/8cc59443-164b-4678-abda-4b5814ddf589

Control of polarization in bulk ferroelectrics by mechanical dislocation imprint

Autor: Lin Zhou, Jurij Koruza, Pedro B. Groszewicz, Xiandong Zhou, Marion Höfling, Lukas M. Riemer, Bai-Xiang Xu, Enrico Bruder, Fangping Zhuo, Karsten Durst, Binzhi Liu, Dragan Damjanovic, Jürgen Rödel, Xiaoli Tan

Publikováno v: Science. 372:961-964

Imprinting oxides Dislocations can be problematic for the properties of functional oxides and are often avoided as a result. Höfling et al. found that introducing a network of dislocations to barium titanate actually enhanced the dielectric and piez

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::42230b31594059ae29431102823924c1
https://doi.org/10.1126/science.abe3810

Nanoindentation pop‐in in oxides at room temperature: dislocation activation or crack formation?

Autor: Kuan Ding, Xufei Fang, Lukas Porz, Marion Höfling, Yingwei Li, Karsten Durst, Hanna Bishara, Hanna Tsybenko, Enrico Bruder, Gerhard Dehm

Publikováno v: Journal of the American Ceramic Society

Most oxide ceramics are known to be brittle macroscopically at room temperature with little or no dislocation-based plasticity prior to crack propagation. Here, we demonstrate the size-dependent brittle to ductile transition in SrTiO3 at room tempera

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14aaeb0e474a0d541a4b59dfbf35984b
https://hdl.handle.net/21.11116/0000-0008-A9DF-F21.11116/0000-0009-4500-9