BOND SOFTENING IN MONOLAYER GRAPHITE FORMED ON TRANSITION-METAL CARBIDE SURFACES

被引：184

作者：

AIZAWA, T ^{[1
]}

SOUDA, R ^{[1
]}

OTANI, S ^{[1
]}

ISHIZAWA, Y ^{[1
]}

OSHIMA, C ^{[1
]}

机构：

[1] WASEDA UNIV,DEPT APPL PHYS,SHINJUKU KU,TOKYO 169,JAPAN

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.42.11469

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Full phonon-dispersion curves of the graphitic-layer on some transition-metal carbides were measured by using high-resolution electron-energy-loss spectroscopy. The graphitic layer on (111) surfaces of TaC, HfC, and TiC showed anomalous softening within the layer, whereas the graphite layer on TaC(001) is similar to bulk graphite. The measured phonon dispersion has been analyzed with a force-constant model, and it has been revealed that the force constants for vertical angle bending and for bond twisting are much weaker in the former case. This is ascribed to the charge transfer into the overlayer from the substrate, resulting in the weakening of the pi bond in graphite. The clear contrast in variations of phonons between the graphitic layer on TaC(111) and that on TaC(001) indicates that the microscopic structure at the interface determines the charge transfer.

引用

页码：11469 / 11478

页数：10

共 41 条

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