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内容記述 |
Understanding the internal strain and polarization domain structures in ferroelectric ceramics is essential for optimizing their dielectric and piezoelectric performance. In this study, we present the application of Bragg coherent X-ray diffraction imaging (Bragg-CDI) for three-dimensional visualization in a non-destructive manner of such mesoscale structures in single nanocrystals [1,2]. Developed at the Harima site of QST, our Bragg-CDI system enables high-resolution imaging of internal strain and domain onfigurations in a particle with a size ranging from 40 to 500 nm [3,4,5]. By combining Bragg-CDI with in situ heating capabilities, we have successfully tracked structural phase transitions and domain evolution under thermal stimuli [6]. This approach provides critical insights into how external factors such as particle shapes and grain boundaries interact with intrinsic mechanisms like phase transitions to affect material properties. A notable example is the 3D reconstruction of 90° polarization domains in a 400 nm BaTiO₃ particle at tetragonal phase [7]; this result reveals domain boundaries and strain distributions that directly impact dielectric behavior. Such mesoscale features are inaccessible by conventional microscopy techniques; therefore, Bragg-CDI has the unique advantage for probing those functional nanostructures. This methodology opens new pathways for the design and evaluation of advanced ferroelectric ceramics. By enabling non-destructive, multiscale structural analysis, Bragg-CDI holds significant promise for accelerating the development of next-generation dielectric and piezoelectric materials. |
