About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
Two-dimensional Local Lattice Distortions in Inorganic Halide Perovskites |
Author(s) |
Stephan Rosenkranz, Matthew J. Krogstad, Xing He, Tyson Lanigan-Atkins, Feng Ye, Yaohua Liu, Duck-Young Chung, Olivier Delaire, Raymond Osborn |
On-Site Speaker (Planned) |
Stephan Rosenkranz |
Abstract Scope |
Inorganic halide perovskites are of interest because of their photoelectronic properties. These systems in general exhibit a cubic structure at high temperature and undergo transitions to tetragonal and orthorhombic symmetry at lower temperatures. While the long-range ordered structures are well understood, lattice fluctuations and local ordering are believed to underlie the optical and thermal properties, but details regarding the short-range ordering, the extent of the correlations, and whether there are commonalties across different families of compounds remain poorly understood. Measuring complete volumes of single-crystal diffuse scattering over large ranges of temperature allows us to investigate local ordering in these systems in detail. We show that the diffuse scattering observed in a number of different compounds can be understood in terms of the halide octahedral tilts that define the lower-temperature long-range ordered structures that persist in short-range ordered, two-dimensional form into the higher-temperature phases. Work supported by DOE BES DMSE |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Electronic Materials, Energy Conversion and Storage |