Raman spectroscopy of the BC₃ phase obtained under high pressure and high temperature

Abstract A direct transformation of the g ‐BC 3 phase to a new diamond‐like d ‐BC 3 phase was observed in a diamond‐anvil cell (DAC) at high temperature, 2033 ± 241 K, and high pressure, 50 GPa. Analysis of the peak positions of the d ‐BC 3 , B 4 C, α‐boron, and the boron‐doped diamond leads to the conclusion that the positions of the peaks of the d ‐BC 3 are more similar to the peak pattern of the boron‐doped diamond rather than that of boron carbide, α‐boron. Copyright © 2007 John Wiley & Sons, Ltd.