Electronic structure and chemical bonding of amorphous chromium carbide thin films

Abstract

The microstructure, electronic structure and chemical bonding of chromium carbide thin films with different carbon contents have been investigated with high-resolution transmission electron microscopy, electron energy loss spectroscopy and soft x-ray absorptionemission spectroscopies. Most of the films can be described as amorphous nanocomposites with non-crystalline CrC x in an amorphous carbon matrix. At high carbon contents, graphene-like structures are formed in the amorphous carbon matrix. At 47at.% carbon content, randomly oriented nanocrystallites are formed creating a complex microstructure of three components. The soft x-ray absorptionemission study shows additional peak structures exhibiting non-octahedral coordination and bonding. © 2012 IOP Publishing Ltd.