SKM 2021 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Poster Session KFM
KFM 5.21: Poster
Tuesday, September 28, 2021, 16:00–17:00, P
Quantitative mapping of nanotwin variants and elastic energy in the bulk — •Jan Schultheiß1, Lukas Porz2, Lalitha Kodumudi Venkataraman2, Marion Höfling2, Can Yildirim3, Phil Cook3, Carsten Detlefs3, Semen Gorfman4, Jürgen Rödel2, and Hugh Simons5 — 1NTNU Norwegian University of Science and Technology, Trondheim, Norway — 2Technical University of Darmstadt, Darmstadt, Germany — 3European Synchrotron Radiation Facility, Grenoble, France — 4Tel Aviv University, Tel Aviv, Israel — 5Technical University of Denmark, Lyngby, Denmark
Most state-of-the-art high-resolution imaging techniques are limited to probing the sample surface. This is a particular drawback for the characterization of twinned materials as the strain state changes from biaxial at the surface to triaxial in the bulk, dramatically influencing the functional properties. Here, we demonstrate mapping of nanotwin variants highly localized in the bulk utilizing the full reciprocal space intensity distributions obtained from Dark-Field X-Ray micorscopy. We demonstrate our method for a high-performance polycrystalline ferroelectric/ferroelastic (Ba,Ca)(Zr,Ti)O3 model system whose excellent piezoelectric properties originate from domain sizes of 10-100 nm. We find that the density of twin variants inside the grain is 30% smaller compared to the density in the vicinity of the grain boundary, following the trend of the elastic energy. The obtained elasto-morphological correlations are crucial for many twinned materials, ranging from complex oxides to martensitic materials or high entropy alloys.