Nanosecond Pulse Laser Heating of Graphite in DAC
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Laser heating with nanosecond pulses was performed in DAC for the first time. The heated graphite transforms to a transparentdiamond-like state at pressures up to 35 GPa as follows from the micro-Raman studies. The scanning transmission electron microscopy (STEM) analysis shows the heated material is intermediate between the sp<SUP>2</SUP> and sp<SUP>3</SUP> materials. Other observed phenomena are connected with ablation. Spherical droplets and nanocrystals were found at the surface as a product of condensation of the evaporated carbon. Possibly nitrogen (high-pressure medium) reacts with the species of ablated carbon. STEM analysis showed the incorporation of nitrogen in the heated sample.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1013-1015, 1998
The Japan Society of High Pressure Science and Technology