Depressurization Amorphization of Single-Crystal Boron Carbide

被引：147
|
作者：
Yan, X. Q. [1 ,2 ]
Tang, Z. [3 ]
Zhang, L. [1 ]
Guo, J. J. [1 ]
Jin, C. Q. [4 ]
Zhang, Y. [2 ]
Goto, T. [5 ]
McCauley, J. W. [6 ]
Chen, M. W. [1 ,5 ]
机构：
[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Univ Sci & Technol Beijing, Dept Mat Phys & Chem, Beijing 100083, Peoples R China
[3] E China Normal Univ, Key Lab Polar Mat & Devices, Shanghai 200062, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[6] USA, Res Lab, Aberdeen Proving Ground, MD 21005 USA
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 07期
关键词：
RAMAN-SPECTROSCOPY; SHOCK COMPRESSION; HIGH-PRESSURE; DIAMOND; B4C;
D O I：
10.1103/PhysRevLett.102.075505
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report depressurization amorphization of single-crystal boron carbide (B4C) investigated by in situ high-pressure Raman spectroscopy. It was found that localized amorphization of B4C takes place during unloading from high pressures, and nonhydrostatic stresses play a critical role in the high-pressure phase transition. First-principles molecular dynamics simulations reveal that the depressurization amorphization results from pressure-induced irreversible bending of C-B-C atomic chains cross-linking 12 atom icosahedra at the rhombohedral vertices.
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页数：4
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