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Quantitative High‐Dynamic‐Range Electron Diffraction of Polar Nanodomains in Pb 2 ScTaO 6
Author(s) -
Peters Jonathan J. P.,
Sanchez Ana M.,
Walker David,
Whatmore Roger,
Beanland Richard
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201806498
Subject(s) - materials science , metastability , electron diffraction , antiferroelectricity , diffraction , polar , atmospheric temperature range , dielectric , electron , spectroscopy , crystallography , chemical physics , ferroelectricity , optics , thermodynamics , chemistry , physics , optoelectronics , organic chemistry , quantum mechanics , astronomy
Highly B‐site ordered Pb 2 ScTaO 6 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.