Raman spectroscopy for studying the synthesis of conducting BC3 hetero-diamonds in diamond anvil cell under high temperature

Abstract

Abstract A direct transformation of the sintered BC3 phase to a novel diamond-like d-BC3 phase was observed in a diamond anvil cell (DAC) at high temperature, 2500 K and high pressure, 22 GPa. For heating a specimen in a DAC a laser heating (LH) system combined with an acousto-optical filter and synchronized with a video camera was used. Combining the LH system with the acousto-optical filter allows measurement of the temperature distribution under infrared (1064 nm) LH of a specimen under high pressure in a DAC. The starting material with a composition BC3 was obtained by sintering a powder of nanodiamonds with a powder of boron microparticles at 6.0 GPa during 150 s heating at 1200 °C. The quenched BC3 specimen was studied by the Raman spectroscopy.