COMPRESSIBILITY, PHASE TRANSITIONS AND AMORPHIZATION OF CORONENE AT PRESSURES TO 6 GPA
A. D. Chanyshev1,2, A. Yu. Likhacheva1,3, P. N. Gavryushkin1,2, K. D. Litasov1,2
1V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Ac. Koptyuga ave., Novosibirsk 630090, Russia
2Novosibirsk State University, 2 Pirogova st., Novosibirsk, 630090, Russia
3G.I. Budker Institute of Nuclear Physics SB RAS, 11 Ac. Lavrentieva prospect, Novosibirsk, 630090, Russia
Keywords: дифрактометрия при высоких давлениях, ячейка с алмазными наковальнями, коронен, сжимаемость, High pressure, X-ray diffraction, diamond anvil cell, coronene, compressibility
Abstract
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 P 2/ 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.
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