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Scanning electron acoustic microscopy of electric domains in ferroelectric materials

机译:铁电材料中电畴的扫描电子声显微镜

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摘要

Electric domains in single-crystal and polycrystalline barium titanate (BaTiO_3) have been observed by use of scanning electron acoustic microscopy (SEAM). A model is presented of the SEAM signal generation, spatial resolution, and contrast mechanism associated with the imaging of electric domains in ferroelectric materials. The SEAM signal is found to depend directly on the sum of the piezoelectric coupling coeffcient and spontaneous polarization of the domain, on the charge density of the electron beam interaction volume, and inversely on both the permittivity and the elastic constants of the material. Application of the model to BaTiO_3 yields a contrast of roughly 3.5 from 90°domain structures and 6.8 from l80 °domain structures.
机译:单晶和多晶钛酸钡(BaTiO_3)中的电畴已通过扫描电子声显微镜(SEAM)进行了观察。提出了与铁电材料中电畴成像相关的SEAM信号生成,空间分辨率和对比机制的模型。发现SEAM信号直接取决于畴的压电耦合系数和自发极化的总和,电子束相互作用体积的电荷密度,并且反过来取决于材料的介电常数和弹性常数。该模型在BaTiO_3上的应用产生了90°畴结构的大约3.5的对比度和180°畴结构的6.8的对比度。

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