使用STEM和EELS在晶体中的原子列的元素选择性成像
Koji Kimoto1, Toru Asaka, Takuro Nagai
1National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. kimoto.koji@nims.go.jp
Nature
|October 30, 2007
概括
这项研究使用扫描传输电子显微镜 (STEM) 和电子能量损失光谱 (EELS) 实现了原子分辨率的元素选择性成像. 研究人员可视化了层叠的矿中的原子柱,进步了材料表征技术.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 微观结构的表征对于理解像相关氧化物这样的复杂材料至关重要.
- 原子分辨率成像是关键目标,但这种规模的特定元素分析仍然具有挑战性.
- 扫描传输电子显微镜 (STEM) 结合电子能量损失光谱 (EELS) 显示出对原子列分析的前景.
研究的目的:
- 为了实现原子分辨率的元素选择性成像.
- 使用STEM-EELS克服材料二维分析的局限性.
- 为了使复杂氧化物的详细微观结构特征.
主要方法:
- 使用了稳定扫描传输电子显微镜.
- 使用局部无弹性散射技术.
- 集成STEM与电子能量损失光谱 (EELS) 进行原子列分析.
主要成果:
- 证明成功地对一个晶体样本进行了原子柱成像.
- 实现了La,Mn和O原子列的元素选择性可视化.
- 在层叠的矿La1.2Sr1.8Mn2O7.7中产生了原子柱的二维图像.
结论:
- 这项工作克服了先前的搬迁和仪器仪表不稳定的困难.
- 开发的技术可以实现前所未有的原子分辨率,元素特定成像.
- 强相关氧化物和其他复杂材料的微观结构特征预计将取得进展.
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