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Temperature-dependent high energy-resolution EELS of ferroelectric and paraelectric BaTiO_3 phases

机译：铁电和顺电BaTiO_3相的温度相关的高能量分辨率EELS

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摘要

Probing the ferroelectricity at the nanometer scale is of particular interest for a wide range of applications. In this Rapid Communication, the structural distortion of BaTiO_3 (BTO) is studied in its ferroelectric (rhombohedral and tetragonal), and paraelectric phases from the O K near edge structures in electron energy loss spectroscopy. Modifications of the electronic structure are detected in the lowest energy fine structure (FS) of the O K edge in the ferroelectric phases, and are interpreted by core-hole valence-electron screening geometry. For the paraelectric phase, the lowest energy FS of the O K edge is comparable to the one obtained at room temperature, which is inconsistent with an expected cubic structure. The variations observed in the O K near edge structures, such as a broader and more asymmetric lowest energy FS at low temperature, suggest that the magnitude of the Ti~(4+) off-centering along 〈111〉 increases in lower-temperature phases. These findings demonstrate the sensitivity of the O K near edge structures to the structural distortions of BTO polymorphs, and form a basis for further investigations on defective or strained BTO at the nanoscale.
机译：在纳米范围内探测铁电对于广泛的应用特别重要。在本快速通讯中，研究了BaTiO_3（BTO）的结构畸变，包括铁电相（菱面体和四边形），以及在电子能量损失谱中来自O K近边缘结构的顺电相。在铁电相的O K边缘的最低能量精细结构（FS）中检测到电子结构的变化，并通过核孔价电子筛选几何学来解释。对于顺电相，O K边的最低能量FS与在室温下获得的能量相当，这与预期的立方结构不一致。在O K附近边缘结构中观察到的变化，例如在低温下更宽且更不对称的最低能量FS，表明Ti〜（4+）偏心沿<111>的幅度在低温相中增加。这些发现证明了OK近边缘结构对BTO多晶型物的结构变形的敏感性，并为进一步研究纳米级缺陷或应变BTO奠定了基础。

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  • 来源
    《Physical review》 |2016年第2期|020102.1-020102.5|共5页
  • 作者

    Matthieu Bugnet; Guillaume Radtke; Steffi Y. Woo; Guo-zhen Zhu; Gianluigi A. Botton;

  • 作者单位

    Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L7;

    Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), Sorbonne Universites, Universite Pierre et Marie Curie (UPMC) Paris 6, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD UMR 206, 4 Place Jussieu, F-75005 Paris, France;

    Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L7;

    Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L7,State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China;

    Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L7;

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