Boron carbide icosahedra and the 1280 cm-1 line in amorphous hydrogenated boron carbide

被引:11
作者
Lin, SH [1 ]
Feldman, BJ
机构
[1] Univ Missouri, Dept Phys, St Louis, MO 63121 USA
[2] Univ Missouri, Ctr Mol Elect, St Louis, MO 63121 USA
关键词
disordered systems; chemical synthesis; optical properties; light absorption and reflection;
D O I
10.1016/S0038-1098(98)00192-6
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We report infrared absorption measurements that provide evidence for the presence of boron carbide icosahedra in amorphous hydrogenated boron carbide thin films. The infrared absorption spectra are dominated by an intense line at 1280 cm(-1) with a FWHM of similar or equal to 320 cm(-1) Similar lines have been previously reported in polycrystalline boron carbide, where boron carbide icosahedra make up the unit cell. In both systems, the linewidth narrows and the peak position shifts to higher energy with increasing carbon concentrations. From annealing studies of amorphous hydrogenated boron carbide, hydrogen plays a very small role in the 1280 cm(-1) line. Finally, the integrated intensity of the 1280 cm(-1) line is a sublinear function of the boron concentration, providing further evidence that the boron content of these icosahedra increases as the boron concentration of the film increases. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:239 / 242
页数:4
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