| Issue |
Europhys. Lett.
Volume 43, Number 3, August I 1998
|
|
|---|---|---|
| Page(s) | 302 - 307 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00356-y | |
| Published online | 01 September 2002 | |
Phase transitions of 
-intercalated 
crystals
1
Laboratory of Crystallography, University of Bayreuth, D-95440 Bayreuth, Germany
2
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
3
Department of Molecular and Laser Physics, University of Nijmegen, Toernooiveld, NL-6525 ED Nijmegen, The Netherlands
Received:
14
April
1998
Accepted:
11
June
1998
We report the temperature dependence of the specific heat of
, and the temperature dependence of the
lattice parameter, as determined by X-ray powder diffraction.
A first-order phase transition and a glass transition are found to occur
at temperatures below the corresponding transition temperatures
of pure .
The transition temperatures depend on x.
Specific-heat measurements on a sample with 
show the orientational ordering transition at 
K and
the glass transition at 
.
Contrary to pure , the temperature dependence of the
lattice parameter of 
(
)
does not show an anomaly
at the glass transition, which is explained by the already
expanded lattice of .
The energy difference between major and minor orientations
is determined as 19.1 meV.
PACS: 61.48.+c – Fullerenes and fullerene-related materials / 65.40.+g – Heat capacities of solids / 64.70.Pf – Glass transitions
© EDP Sciences, 1998
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