通过原子对分布函数技术解决的V(2)O(5)*nH(2)O异的结构
Valeri Petkov1, Pantelis N Trikalitis, Emil S Bozin
1Department of Physics and Astronomy and Center for Fundamental Materials Research, Michigan State University, East Lansing 48824, USA.
Journal of the American Chemical Society
|August 22, 2002
概括
确定了氧化 (V(2) O(5)) 聚凝的原子结构,揭示了由水分离的双层V(2) O(5) 层. 这说明了这种材料长期存在的结构问题.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 纳米材料是一种纳米材料.
背景情况:
- 氧化 (V(2) O(5)) 聚合物是重要的材料,在催化和储能方面具有应用.
- 了解它们的局部和远程原子结构对于优化它们的特性至关重要.
- 之前的研究在充分阐明复杂的流层结构方面面临着挑战.
研究的目的:
- 解决关于V(2) O(5) *nH(2) O异的局部和远程原子结构的长期模糊问题.
- 为了提供一个详细的三维结构模型的Xerogel.
- 为了研究V(2) O(5) 层的堆叠和排序.
主要方法:
- 使用了原子对分布函数 (PDF) 技术.
- 使用的X射线衍射 (XRD) 数据分析.
- 进行结构建模和改进.
主要成果:
- 确定了V(2)O(5)*nH(2)O xerogel.O 层状流体的完整三维结构.
- 证明克塞罗格尔板块由两层V(2) O(5) 层组成,由方形金字塔形VO(5) 单元组成.
- 确定了一个单临床单元细胞 (空间组C2/m),具有特定的格子参数 (a = 11.722(3) Å,b = 3.570(3) Å,c = 11.520(3) Å,β = 88.65°).
- 在堆叠序列中观察到的流层乱的特征,其结构连贯性仅限于50 Å.
结论:
- 原子尺度结构的V(2)O(5)*nH(2)O施色凝是很好地描述了堆叠的双层V(2)O(5)层.
- 水分子在这些双层之间相互间接.
- 这项研究成功地解决了长期存在的V(2) O(5) 凝的结构问题,为未来的研究和应用提供了基础.
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