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Adv Mater. 2019 Feb;31(5):e1806498. doi: 10.1002/adma.201806498. Epub 2018 Dec 6.

Quantitative High-Dynamic-Range Electron Diffraction of Polar Nanodomains in Pb2 ScTaO6.

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Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
Department of Materials, Royal School of Mines, South Kensington Campus, Imperial College London, London, SW7 2AZ, UK.


Highly B-site ordered Pb2 ScTaO6 crystals are studied as a function of temperature via dielectric spectroscopy and in situ high-dynamic-range electron diffraction. The degree of ordering is examined on the local and macroscopic scale and is determined to be 76%. Novel analysis of the electron diffraction patterns provides structural information with two types of antiferroelectric displacements determined to be present in the polar structure. It is then found that a low-temperature transition occurs on cooling at ≈210 K that is not present on heating. This phenomenon is discussed in terms of the freezing of dynamic polar nanodomains where a high density of domain walls creates a metastable state.


dielectric spectroscopy; electron diffraction; polar tweed; relaxor ferroelectric


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