1994
DOI: 10.1007/bf01316845
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Structural phase transitions in ‘hcp’ C70 single-crystals

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Cited by 30 publications
(17 citation statements)
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“…But the anomalies which we measure at different transitions are qualitatively so much different, that they could not be due to the same process in two structures, which differ only by their stacking sequence. Our data as well as high resolution dilatometry experiments[5] suggest that the anomaly at 303 K is due to a third intrinsic phase transition and that the transition temperatures in fccand hcp-C,O are practically the same.…”
supporting
confidence: 62%
“…But the anomalies which we measure at different transitions are qualitatively so much different, that they could not be due to the same process in two structures, which differ only by their stacking sequence. Our data as well as high resolution dilatometry experiments[5] suggest that the anomaly at 303 K is due to a third intrinsic phase transition and that the transition temperatures in fccand hcp-C,O are practically the same.…”
supporting
confidence: 62%
“…At high temperature 2 350 K, solid C70 forms an orientationally disordered phase (Christides et al, 1994) with a fcc lattice, similar to the high temperature phase of solid C60. Depending on the treatment of the sample, also a hexagonal close packed structure exists (Vaughan et al, 1991;Verheijen et al, 1992;Meingast et al, 1994;McGhie et al, 1994). In the following we will consider the case of a fcc high T phase (space group Fmjm).…”
Section: Solid C70 Bilinear Coupling Of Molecular Rotations To Centementioning
confidence: 99%
“…To describe the intermolecular interaction due to charge-density variations on C-C, bonds 25 we introduce ''double bond'' centers of interaction ͑called D centers͒ and ''intermediate bond'' centers ͑called I cen-ters͒. There are five D centers in each of the planes Ϯz (6) and in planes Ϯz (7). Finally there are five I centers in each of the planes Ϯz(8) and ten in each plane Ϯz(9) ͑see also Table I of Ref.12͒.…”
Section: Orientational Coordinates and Interaction Potentialmentioning
confidence: 99%
“…Depending on the treatment of the sample, also a hexagonal closepacked structure exists. 1,2,6,7 Upon cooling from the fcc phase, a transition to a rhombohedral phase ͑space group R3m) occurs, followed by a transition to a monoclinic phase around 295 K. [2][3][4] Unlike in solid C 60 where the transition from the Fm3m to the Pa3m phase is essentially a phenomenon of orientational ordering, [8][9][10] while the centers of mass of the molecules still occupy an fcc lattice, the transition from the cubic to the rhombohedral phase in solid C 70 is due to a coupling of orientational quadrupoles of T 2g symmetry to trigonal shear strains. 11,12 Such a bilinear coupling which is characteristic for ferroelastic transitions, 13 is favored by the elongated shape of the C 70 molecule.…”
Section: Introductionmentioning
confidence: 99%