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8.20】Martin Magnuson
题目:Anisotropy in the...
 
2010-08-18 | 文章来源:高性能陶瓷材料研究部        【 】【打印】【关闭

题 目:Anisotropy in the electronic structure of Mn+1AXn-phases probed by x-ray emission spectroscopy in comparison to ab initio calculations

报告人:Martin Magnuson

    Thin Film Physics Division,
      Department of Physics, Chemistry, and Biology (IFM),
      Linköping University, Sweden

时 间:8月20日(周五)上午9:30-11:00

地 点:李薰楼468房间

欢迎参加!  

Abstract:

An important class of nanolaminates explored at Linköping University is the Mn+1AXn-phases, which are carbides and nitrides that form layered ternary ceramics. For example, the anisotropy in the electronic structure of an epitaxially grown film of Ti3SiC2 was investigated and compared to amorphous silicon. The anisotropy of the electronic structure and chemical bonding of Ti3SiC2 has been investigated using bulk-sensitive and element selective x-ray fluorescence spectroscopy. The differences between the in-plane and out-of-plane bonding at the internal interfaces of the nanolaminates were investigated in detail by angle-resolved precision measurements. The Ti L, C K and Si L1, L2,3 emission spectra of Ti3SiC2 are compared with first-principles density-functional theory including core-to-valence dipole transition matrix elements. Strongly hybridized spectral shapes are detected for Si imbedded in Ti3SiC2. The anisotropy of the electronic structure and chemical bonding is discussed in relation to the various hybridization regions of related Mn+1AXn-phases and macroscopic properties such as conductivity, elasticity and thermopower.

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