Raman spectroscopy of pressure-induced amorphous boron carbide
Raman spectroscopy of pressure-induced amorphous boron carbide
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DOI：
10.1063/1.2189826
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发表时间：
2006-03
影响因子：
4
通讯作者：
X. Yan;W. J. Li;T. Goto;Mingwei Chen
中科院分区：
文献类型：
--
作者：
X. Yan;W. J. Li;T. Goto;Mingwei Chen
我们报告了压力诱导非晶碳化硼 (a-B4C) 的低温和高温拉曼光谱。在加热过程中，a-B4C 中碳簇的粗化得到了表征，而在冷却过程中，观察到了 a-B4C 拉曼峰位移的异常温度系数。这些结果通过实验证明B4C的非晶化与C-B-C链的破坏有关，并且a-B4C由sp2碳芳环和硼簇组成。这种具有相对较弱的碳 sp2 键的无序结构被认为是导致 B4C 在高压下剪切强度损失的原因。
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 sp2 carbon aromatic rings and boron clusters. This disordered structure with relatively weak carbon sp2 bonds is believed to be responsible for the loss of B4C shear strength at high pressures.