Ferroic materials described by Landau theory of symmetry-breaking have had a substantial impact on fundamental science and various applications. Numerous types of topological order in ferroics (ferromagnets, ferroelectrics, ferroelastics, multiferroics) are even more numerous and enigmatic than different types of symmetry-breaking, and consequently, topological phase transitions in ferroics become one of the key fundamental problems and a widely-studied subject in the scientific community. Here, we utilize state of the art X-ray Bragg coherent diffractive imaging in consort with Landau theoretical modelling to image in 3D topological defects in ferroelectric BaTiO_3 nanocrystal. Bragg coherent diffractive imaging is amenable to imaging defects and dynamics in a large host of materials.
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