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Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation
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View: Figures


Image of FIG. 1.
FIG. 1.

Raman spectra of solvated C/m-xylene crystals (black) and desolvated crystals at selected pressures.

Image of FIG. 2.
FIG. 2.

Pressure dependence of the characteristic H(7), A(2), and H(8) modes for the solvated (square) and desolvated (triangle) samples.

Image of FIG. 3.
FIG. 3.

Optical pictures of the diamond anvils after pressure cycles to 44.5 GPa and 44 GPa, respectively, for (I) solvated C creating a ring crack and (II) desolvated C giving a small crack (see arrow). Both culets are 300 m in diameter.

Image of FIG. 4.
FIG. 4.

(a) Raman spectra of solvated C crystals released from 20.5 GPa. Inset shows the Lorentzian fit to the A(2) modes; (b) Raman spectra of (I) desolvated C released from 44.5 GPa; (II) solvated C released from 44 GPa; (III) solvated C released from 35 GPa; and (IV) released solvated C after laser irradiation. The excitation laser used had a wavelength of 830 nm.

Image of FIG. 5.
FIG. 5.

HRTEM images of decompressed solvated C, (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. . (c) HRTEM images and (d) SAED of the decompressed de-solvated C. 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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pressure-induced transformation and superhard phase in fullerenes: The effect of solvent intercalation