A three-dimensional polarization domain retrieval method from electron diffraction data

作者：Pennington Robert S^*; Koch Christoph T

来源：Ultramicroscopy, 2015, 155: 42-48.

DOI：10.1016/j.ultramic.2015.04.002

• Quantitative three-dimensional characterization
• Ferroelectric domains
• Polarization
• Artificial neural networks
• Convergent-beam electron diffraction
• Multiple scattering

We present an algorithm for retrieving three-dimensional domains of picometer-scale shifts in atomic positions from electron diffraction data, and apply it to simulations of ferroelectric polarization in BaTiO3. Our algorithm successfully and correctly retrieves polarization domains in which the Ti atom positions differ by less than 3 pm (OA% of the unit cell diagonal distance) with 5 and 10 nm depth resolution along the beam direction, and we also retrieve unit cell strain, corresponding to tetragonal-to-cubic unit cell distortions, for 10 nm domains. Experimental applicability is also discussed.

• 出版日期2015-8