Structural phase transitions in single crystal C60

R. Moret , P. Albouy , V. Agafonov , R. Ceolin , D. André , A. Dworkin , H. Szwarc , C. Fabre , A. Rassat , A. Zahab , P. Bernier

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 anciens

R. Moret, P. Albouy, V. Agafonov, R. Ceolin, D. André, et al.. Structural phase transitions in single crystal C60. Journal de Physique I, 1992, 2 (5), pp.511-515. ⟨10.1051/jp1:1992161⟩. ⟨jpa-00246504⟩