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通过温度依赖的EXAFS探测到纳米颗粒中的局部结构和结合
Hiroyuki Ikemoto1, Takafumi Miyanaga2, Shuki Tokuchi1
1Department of Physics, University of Toyama, Toyama 930-8555, Japan.
概括
锡纳米粒子 (n-Sn) 呈现无形结构,而不是像α-tin (α-Sn) 这样的完美钻石结构. 它们的共价键随着温度的增加而减弱和延长,与α-Sn.不同.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 固态物理 固态物理
背景情况:
- 据预测,锡纳米粒子 (n-Sn) 根据粒子大小在半导体 (α-Sn) 和金属 (β-Sn) 结构之间呈现相变.
- 这些转变类似于在室温附近观察到的温度诱导的相变.
研究的目的:
- 调查直径为24.7 Å的锡纳米粒子 (n-Sn) 的局部结构和结构参数.
- 要确定n-Sn是否采用与α-Sn相似的钻石结构或表现出无形的特征.
主要方法:
- 使用的X射线吸收细结构 (XAFS) 测量.
- 分析了最近邻居的原子距离,坐标数和平均平方相对位移.
主要成果:
- 最接近邻居的距离表明它与α-Sn.的钻石状结构有相似之处.
- 观察到协调数减少和位移增加,表明无形性质.
- 与α-Sn不同的是,n-Sn中的共价键随温度而变长,并且具有较弱的结合强度.
结论:
- 锡纳米粒子 (n-Sn) 不具有完美的钻石结构,而是无形结构.
- n-Sn的结构和粘合性能与散装α-Sn有很大的不同,特别是温度依赖性和粘合强度.
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