Estimating the dopant distribution in Ca-doped α-SiAlON: statistical HAADF-STEM analysis and large-scale atomic modeling

被引：4
|
作者：
Sakaguchi, Norihito [1 ]
Yamaki, Fuuta [1 ]
Saito, Genki [1 ]
Kunisada, Yuji [1 ]
机构：
[1] Hokkaido Univ, Lab Integrated Funct Mat, Ctr Adv Res Energy & Mat, Fac Engn,Kita Ku, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan
来源：
MICROSCOPY | 2016年 / 65卷 / 05期
基金：
日本学术振兴会;
关键词：
alpha-SiAlON; HAADF-STEM; multi-slice simulation; electron channeling; Monte Carlo simulation; dopant distribution; MECHANICAL-PROPERTIES; CRYSTAL-STRUCTURE; CERAMICS; MICROSTRUCTURE; ADDITIVES; BEHAVIOR; PHASE;
D O I：
10.1093/jmicro/dfw020
中图分类号：
TH742 [显微镜];
学科分类号：
摘要：
We investigated the dopant distribution in Ca-doped alpha-SiAlON by using high-angle annular dark-field scanning transmission electron microscopy and a multi-slice image simulation. Our results showed that the electron wave propagated by hopping to adjacent Si(Al) and N(O) columns. The image intensities of the Ca columns had wider dispersions than other columns. To estimate the Ca distribution in the bulk material, we performed a Monte Carlo atomic simulation of the alpha-SiAlON with Ca dopants. A model including a short-range Coulomb-like repulsive force between adjacent Ca atoms reproduced the dispersion of the intensity distribution of the Ca column in the experimental image.
引用
收藏
页码：400 / 406
页数：7
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