当前位置: X-MOL 学术Ultramicroscopy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Accuracy and precision of position determination in ISTEM imaging of BaTiO3
Ultramicroscopy ( IF 2.2 ) Pub Date : 2021-05-23 , DOI: 10.1016/j.ultramic.2021.113325
Dennis Marquardt 1 , Marco Schowalter 1 , Florian F Krause 1 , Tim Grieb 1 , Christoph Mahr 1 , Thorsten Mehrtens 1 , Andreas Rosenauer 2
Affiliation  

In this paper we study the effect of lens aberrations (spherical aberration and astigmatism), beam tilt, contamination and shot noise on the accuracy and precision of position determination in imaging scanning transmission electron microscopy (ISTEM) on the example of BaTiO3. ISTEM images are simulated as a function of sample thickness and defocus starting from a nearly perfect microscope setting. A defocus range was identified, in which atom column positions were reliably visible and could be decently measured. By averaging over this defocus and thickness range a figure of merit was defined and used to study the influence of above mentioned disturbing effects as a function of their strength. It turned out that column positions might become inaccurate, but distances are measured accurately. These were used to obtain recommendations for the experimental setup to measure the atomic arrangement that induces ferroelectric switching of BaTiO3.



中文翻译:

BaTiO的ISTEM成像中位置确定的精度和精确度3

在本文中,我们以BaTiO为例研究了透镜像差(球面像差和像散),光束倾斜,污染和散粒噪声对成像扫描透射电子显微镜(ISTEM)中位置确定的精度和精确度的影响。3。从接近完美的显微镜设置开始,将ISTEM图像模拟为样品厚度和散焦的函数。确定了散焦范围,在该范围内可以可靠地看到原子列的位置,并且可以适当地进行测量。通过对该散焦和厚度范围进行平均,定义了品质因数,并用于研究上述干扰效应的影响,这些影响是它们的强度的函数。事实证明,列的位置可能会变得不准确,但是距离的测量是准确的。这些用于获得建议的实验设置,以测量引起BaTiO铁电开关的原子排列3

更新日期:2021-05-24
down
wechat
bug