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![Reduced dimensional ferroelectric domains and their characterization techniques](https://image.oaes.cc/3d89e922-f702-431e-8c5c-17c2e1dcce51/microstructures3067.fig.6.jpg)
Figure 6. Polymorphic domain structure of HfO2. (A) Monoclinic atomic structures with three different directions. (B) Orthorhombic atomic structures with three different directions. (C) HAADF-STEM images show intermixed monoclinic and orthorhombic, and tetragonal structure with a few nanometer scales. Reproduced with permission[117]. Copyright 2018, WILEY-VCH Verlag Gmbh & Co. KGaA, Weinheim.