Morphology of C<sub>60</sub>Crystals Grown from the Vapor Phase

Venegas, V.; Rueda-Morales, G.; Cruz-Alvarez, V.; Ortíz-López, J.; Ortega-Cervantes, G.

doi:10.1080/10641229909351387

Cited by 2 publications

(1 citation statement)

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“…For this purpose, the sealed tube was maintained at 800 °C during 8 hours and then cooled down to room temperature at a rate of 1 °C/min. Some details of crystal growth using these procedures have been published elsewhere [26].…”

Section: Methodsmentioning

confidence: 99%

Evolution of molecular ordering and phase transitions in C₆₀/C₇₀solid solutions

Rueda-Morales

Ortíz-López

2004

Physica Status Solidi (b)

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Polycrystalline solid solutions (C 60 ) x :(C 70 ) 1-x with 0 ≤ x ≤ 1 grown by sublimation are studied with AC calorimetry in the 5−300 K temperature range and with X-ray powder diffraction at room temperature. For concentrations 0.15 ≤ x ≤ 0.68, an hexagonal disordered (hcp) single phase is found at room temperature with no evidence of phase transitions occurring down to 5 K. This is indication of complete C 60 /C 70 miscibility and of freezing of orientational disorder at low temperature for this concentration range. Phase transitions below room temperature are detected only for concentrations close to the pure fullerenes, with critical temperatures decreasing as x departs away from x = 0 and 1. The elastic dipole model is applied in pure C 70 and C 70 -rich solid solutions to account for elastic interactions and ferroelastic ordering of the elongated C 70 molecule. Within this model, the evolution of ferroelastic phase transitions in C 70 -rich solid solutions is obtained and compared with available experimental data.

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Section: Methodsmentioning

confidence: 99%