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Quantitative High‐Dynamic‐Range Electron Diffraction of Polar Nanodomains in Pb2ScTaO6
Advanced Materials ( IF 27.4 ) Pub Date : 2018-12-06 , DOI: 10.1002/adma.201806498 Jonathan J. P. Peters 1 , Ana M. Sanchez 1 , David Walker 1 , Roger Whatmore 2 , Richard Beanland 1
Advanced Materials ( IF 27.4 ) Pub Date : 2018-12-06 , DOI: 10.1002/adma.201806498 Jonathan J. P. Peters 1 , Ana M. Sanchez 1 , David Walker 1 , Roger Whatmore 2 , Richard Beanland 1
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Highly B‐site ordered Pb2ScTaO6 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.
中文翻译：
Pb2ScTaO6中极性纳米域的定量高动态范围电子衍射。
通过介电谱和原位高动态范围电子衍射研究了B位高度有序的Pb 2 ScTaO 6晶体与温度的关系。在局部和宏观尺度上检查有序度，确定为76％。电子衍射图谱的新颖分析提供了具有两种反铁电位移的结构信息，这些反铁电位移被确定为存在于极性结构中。然后发现在≈210K的冷却条件下会发生低温转变，而在加热过程中则不会出现这种转变。根据动态极性纳米域的冻结来讨论此现象，在动态极性纳米域中，高密度的畴壁会形成亚稳态。
更新日期：2018-12-06
中文翻译：
Pb2ScTaO6中极性纳米域的定量高动态范围电子衍射。
通过介电谱和原位高动态范围电子衍射研究了B位高度有序的Pb 2 ScTaO 6晶体与温度的关系。在局部和宏观尺度上检查有序度，确定为76％。电子衍射图谱的新颖分析提供了具有两种反铁电位移的结构信息，这些反铁电位移被确定为存在于极性结构中。然后发现在≈210K的冷却条件下会发生低温转变，而在加热过程中则不会出现这种转变。根据动态极性纳米域的冻结来讨论此现象，在动态极性纳米域中，高密度的畴壁会形成亚稳态。
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