Depressurization amorphization of single-crystal boron carbide.
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.
Yan
X Q
XQ
WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Tang
Z
Z
Zhang
L
L
Guo
J J
JJ
Jin
C Q
CQ
Zhang
Y
Y
Goto
T
T
McCauley
J W
JW
Chen
M W
MW