Abstract
The thermal expansion of vapor-grownC70 single crystals ahs been investigated using high-resolution capacitance dilatometry from 5–380 K. Measurements were made both parallel and perpendicular to the hexagonalc-axis. Three first-order phase transitions which we associate with the consecutive disordering of theC70 molecules are observed upon heating at ≈280 K (long-axis spinning), ≈300 K (long-axis precession) and ≈355 K (quasi-free rotation), respectively. The highest-temperature transition exhibits a very large (≈50 K) thermal hysteresis. Powder and single-crystal X-ray diffraction show that the crystals are predominantly hexagonal-close-packed (HCP) with an idealc/a≈1.63 above 360 K andc/a≈1.84 at 295 K.
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