Compressibility, phase transitions and amorphization of coronene at pressures up to 6 GPa

Аннотация

The work is devoted to the experimental study of coronene C₂₄H₁₂ at high pressure and room temperature using in situ X-ray diffraction in a diamond anvil cell. The high-pressure phase P2/m of coronene was found at 0.9 GPa, the PV-equation of state for P2/m coronene phase was defined to 4 GPa: K₀ = 10.8(3) GPa, K₀^′ = 7. At 5.9 GPa partial amorphization of coronene was observed. After the decompression to ambient pressure the high-pressure phase P2/m was preserved, that can be related with partial amorphization.