TY - JOUR
T1 - Structural phase transitions in the fullerene C60
AU - David, W. I.
AU - Ibberson, R. M.
AU - Dennis, T. J.
AU - Hare, J. P.
AU - Prassides, K.
PY - 1992/2/21
Y1 - 1992/2/21
N2 - High-resolution powder neutron diffraction has been used to study the crystal structure of the fullerene C60 in the temperature range 5 K to 320 K. Solid C60 adopts a cubic structure at all temperatures. The experimental data provide clear evidence of a continuous phase transition at ca. 90 K and confirm the existence of a first-order phase transition at 260 K. In the high-temperature face-centred-cubic phase (T > 260 K), the C60 molecules are completely orientationally disordered, undergoing continuous reorientation. Below 260 K, interpretation of the diffraction data is consistent with uniaxial jump reorientation principally about a single (111) direction. In the lowest-temperature phase (T < 90 K), rotational motion is frozen although a small amount of static disorder still persists.
AB - High-resolution powder neutron diffraction has been used to study the crystal structure of the fullerene C60 in the temperature range 5 K to 320 K. Solid C60 adopts a cubic structure at all temperatures. The experimental data provide clear evidence of a continuous phase transition at ca. 90 K and confirm the existence of a first-order phase transition at 260 K. In the high-temperature face-centred-cubic phase (T > 260 K), the C60 molecules are completely orientationally disordered, undergoing continuous reorientation. Below 260 K, interpretation of the diffraction data is consistent with uniaxial jump reorientation principally about a single (111) direction. In the lowest-temperature phase (T < 90 K), rotational motion is frozen although a small amount of static disorder still persists.
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U2 - 10.1209/0295-5075/18/3/006
DO - 10.1209/0295-5075/18/3/006
M3 - Letter
AN - SCOPUS:84948274145
VL - 18
SP - 219
EP - 225
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
SN - 0295-5075
IS - 3
ER -