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Raman spectra of solvated C60/m-xylene crystals (black) and desolvated crystals at selected pressures.
Pressure dependence of the characteristic Hg(7), Ag(2), and Hg(8) modes for the solvated (square) and desolvated (triangle) samples.
Optical pictures of the diamond anvils after pressure cycles to 44.5 GPa and 44 GPa, respectively, for (I) solvated C60 creating a ring crack and (II) desolvated C60 giving a small crack (see arrow). Both culets are 300 μm in diameter.
(a) Raman spectra of solvated C60 crystals released from 20.5 GPa. Inset shows the Lorentzian fit to the Ag(2) modes; (b) Raman spectra of (I) desolvated C60 released from 44.5 GPa; (II) solvated C60 released from 44 GPa; (III) solvated C60 released from 35 GPa; and (IV) released solvated C60 after laser irradiation. The excitation laser used had a wavelength of 830 nm.
HRTEM images of decompressed solvated C60, (a) the areas contain order and amorphous phases; (b) SAED pattern from the ordered areas. The structure can be well indexed by a hexagonal structure with the calculated d-spacings of 0.89–0.92 nm for the (011) plane and of 0.77–0.79 nm for the (120)/(111) plane (not shown), as well as d-spacings with low plane index in the range of 0.4–0.5 nm. A weak and broad diffracted ring with the corresponding d value of around 0.4 nm that are usually from disorder also appears in the recorded patterns, in good agreement with the XRD measurements in Ref. 15 . (c) HRTEM images and (d) SAED of the decompressed de-solvated C60. The obtained d-spacings of 0.65–0.7 nm and 0.45–0.5 nm (not shown) from SAED can be assigned to (002) and (022) planes in a FCC structure, respectively.
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