Mechanical properties and deformation of fullerites

Bobrov, V. S.; Dilanyan, R. A.; Fomenko, L. S.; Iunin, Yu. L.; Lebyodkin, M.A.; Lubenets, S. V.; Орлов, В. И.; Ossipyan, Yu. A.

doi:10.1007/bf00732231

Cited by 23 publications

(4 citation statements)

References 4 publications

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“…The average energy density over the tilt boundary is 80 mJ/m 2 , a rather small value as compared with the 1 J/m 2 energy density of symmetric tilt boundaries in bulk copper [32]. It is noteworthy that this value corresponds rather well with the estimates provided in [33] for the activation energy of deformation processes upon indentation.…”

Section: (A) and 4(b)supporting

confidence: 70%

Disclinations inC60molecular layers onWO2/W(110)surfaces

et al. 2014

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A scanning tunneling microscopy study of a planar close-packed C 60 hexagonal molecular layer on a WO 2 /W(110) substrate reveals the existence of C 60 domains exhibiting two preferred orientations at an angle with an underlying periodic groove structure in the substrate. An analysis of the van der Waals interactions between substrate and layer retrieves the observed misorientations as those corresponding to minima in the interaction energy of the substrate-layer system. The misorientation between two C 60 domains is accommodated in a tilt boundary by a linear array of molecular structural units identified as disclination dipoles, i.e., rotational defects in the hexagonal structure of the layer. A field theory of disclinations and dislocations is used to construct maps of the elastic energy, strains, curvatures, and stresses induced by the lattice defects over the layer. The predicted regions of high compression are found to overlap with those where the fullerene molecules do not undergo rotation.

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Section: (A) and 4(b)supporting

confidence: 70%

Disclinations inC60molecular layers onWO2/W(110)surfaces

et al. 2014

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“…Consequently, no indentation size effect was observed for the (111) face of pristine fullerite. However, contradictory results are reported in this respect [7,10,11,13,20]. The disagreement in results could be caused by surface modification during the procedures of crystal growth, sample storage or hardness testing.…”

Section: Resultsmentioning

confidence: 99%

“…Important information on the peculiarities of photopolymerization in subsurface layers of fullerite crystals can be obtained by the microhardness method as a structure sensitive and local test. The microindentation technique has been successfully used for investigation of the micromechanical properties and structural transformation in fullerite under lightirradiation, pressure and temperature treatments [7,[9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Polymerization and Damage of C60 Single Crystals under Low Fluency Laser Irradiation

Manika

Maniks

Pokulis

et al. 2001

phys. stat. sol. (a)

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Photo-induced hardening, substructure formation and damage of C 60 single crystals under the 632.8 nm He-Ne laser irradiation in air at a power density of 1.47 mW/mm 2 was investigated by microhardness and AFM methods. Photo-induced formation of the dislocation substructure and crystallographically oriented crack patterns on the (111) face due to lattice contraction on polymerization were observed. Two phototransformed states: "soft" (400-450 MPa) and "hard" (650-1000 MPa) are found to appear under laser-irradiation. "Hard" fullerite is created in the subsurface layer < 1 mm at the saturation stage of phototransformation. It softens to 400-450 MPa at 340 K and reverts to non-polymerized state at 470-480 K. The effect of post-irradiation hardening, which appears as an increase of the hardness of laser-irradiated crystals after storage in air in the dark, has been discovered.

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“…The aim of the present work was to investigate the wavelength dependence of phototransformation of C 60 single crystals in air using indentation hardness and dislocation mobility methods. The microindentation as a structure and depth sensitive test has been successfully used earlier in studies of the light-, atmosphere-, pressure and temperature-induced effects in fullerite (4,5,(7)(8)(9)(10)(11)(12). Investigations of the dislocation zone around indents can provide important information about photoinduced processes in the subsurface layer (7,11,13).…”

Section: Introductionmentioning

confidence: 98%