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.

引用

页数：4

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