Raman spectroscopy of pressure-induced amorphous boron carbide

被引：120

作者：

Yan, XQ ^{[1
]}

Li, WJ ^{[1
]}

Goto, T ^{[1
]}

Chen, MW ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 13期

基金：

日本学术振兴会;

关键词：

D O I：

10.1063/1.2189826

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report low- and high-temperature Raman spectroscopy of pressure-induced amorphous boron carbide (a-B4C). Coarsening of carbon clusters in a-B4C was characterized during heating, whereas unusual temperature coefficients of a-B4C Raman peak shifts were observed during cooling. These results experimentally evidence that the amorphization of B4C is associated with the destruction of the C-B-C chains and a-B4C is composed of sp(2) carbon aromatic rings and boron clusters. This disordered structure with relatively weak carbon sp(2) bonds is believed to be responsible for the loss of B4C shear strength at high pressures. (c) 2006 American Institute of Physics.

引用

页数：3

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