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Höfling, Marion
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Publications (7/7 displayed)
- 2024Coupled local residual shear and compressive strain in NaNbO 3 ceramics under coolingcitations
- 2024Coupled local residual shear and compressive strain in NaNbO3 ceramics under coolingcitations
- 2022Anisotropic dislocation-domain wall interactions in ferroelectricscitations
- 2022High-temperature plastic deformation of ⟨110⟩-oriented BaTiO 3 single crystalscitations
- 2021Dislocation-toughened ceramicscitations
- 2021Nanoindentation pop‐in in oxides at room temperature: Dislocation activation or crack formation?citations
- 2020High temperature creep-mediated functionality in polycrystalline barium titanatecitations
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article
Coupled local residual shear and compressive strain in NaNbO3 ceramics under cooling
Abstract
<p>Stabilizing lead-free antiferroelectrics at room temperature is key for advancing greener and more efficient energy storage devices. While NaNbO<sub>3</sub> solid solutions hold great promise for high energy density applications, its pure form displays structural instabilities arising from irreversible electric-field induced phase transitions and/or an undesired coexistence with its ferroelectric polymorph. To unravel how mechanical constraints imposed by residual stresses, structural defects, and microstructure disrupt the stability of the NaNbO<sub>3</sub> antiferroelectric state, we used in situ Dark-Field X-ray Microscopy to map local microstructural deformations in a single embedded {100}<sub>pc</sub> grain. By replicating typical heat treatment conditions, we show that the ferroelectric phase nucleates as a result of the coupled interplay between residual shear and compressive strain distributions that manifest during cooling towards ambient temperature. In addition, the microstrain relaxation behavior indicates that long-range defects preferentially nucleate at the expense of the antiferroelectric phase in regions at sub-micrometer distances from the grain center. Our findings illustrate that adequate temperature control during low temperature sintering, heat treatments, or in operando conditions may be vital in dictating the structure-property relationships of NaNbO<sub>3</sub> ceramics, ensuring their suitability for efficient energy storage applications.</p>