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Phase transitions in C 60 ·C 8 H 8 under hydrostatic pressure
Author(s) -
Francis E. A.,
Durkó G.,
Jalsovszky I.,
Klupp G.,
Kamarás K.,
Kováts É.,
Pekker S.,
Kuntscher C. A.
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200102
Subject(s) - hydrostatic pressure , helium , intercalation (chemistry) , lattice (music) , fullerene , chemistry , phase transition , molecule , condensed matter physics , crystallography , materials science , thermodynamics , physics , inorganic chemistry , organic chemistry , acoustics
High‐pressure infrared transmission measurements up to 9.5 GPa were carried out on the rotor–stator molecular cocrystal C 60 ·C 8 H 8 . Helium served as pressure transmitting medium, which intercalates into the C 60 ·C 8 H 8 lattice. Thus, we investigated the pressure effects and effect of intercalation of helium into the C 60 ·C 8 H 8 lattice. The pressure‐induced shift of the vibrational modes of C 60 ·C 8 H 8 shows an anomaly around 3 GPa. This anomaly can be interpreted in terms of the orientational ordering transition of fullerene molecules accompanied by a change in the crystal symmetry, which causes the splitting of the vibrational modes. We compare the value of the critical pressure to that obtained earlier [Thirunavukkuarasu et al., J. Phys. Chem. C 112 , 17525 (2008); Phys. Status Solidi B 244 , 3857 (2007)].