Structural phase transitions in single crystal C60
Résumé
X-ray diffraction has employed to study the low temperature structural behavior of C60 crystals. The intensity (I) of selected reflections which appear at the face-centered cubic-simple cubic transition was measured as a function of temperature down to 23 K. This orientational ordering transition is found at T0=259±1 K. It displays a hysteresis of about 1 K but no discontinuity of the intensity at T0. Anomalies in d(I)/d(T) around 155 K and 85 K are clearly revealed. They are associated with changes in the C60 molecular reorientations and their origin is discussed.
Domaines
Articles anciensOrigine | Accord explicite pour ce dépôt |
---|