Low temperature heat capacity of fullerite C60 doped with nitrogen
A.M. Gurevich (1), A.V. Terekhov (1), D.S. Kondrashev (1), A.V. Dolbin, (1), D. Cassidy (2), G.E. Gadd (2), S. Moricca (2), B. Sundqvist (3)((1), Institute for Low Temperature Physics & Engineering NASU, Kharkov, Ukraine,, (2) Australian Nuclear Science & Technology Organisation
TL;DR
This study measures the low-temperature heat capacity of nitrogen-doped fullerite C60, analyzing vibrational contributions and finding no evidence of a phase transformation previously observed in dilatometry.
Contribution
It provides detailed analysis of vibrational contributions to heat capacity in N2-doped C60 and discusses the absence of a phase transition at low temperatures.
Findings
No detectable phase transition within experimental error
Quantified contributions from lattice and molecular vibrations
Proposed explanation for the absence of observed phase change
Abstract
The heat capacity Cm of polycrystalline fullerite C60 doped with nitrogen has been measured in the temperature interval 2 - 13 K. The contributions to heat capacity from translational lattice vibrations (Debye contribution), orientational vibrations of the C60 molecules (Einstein contribution) and from the motion of the N2 molecules in the octahedral cavities of the C60 lattice have been estimated. However, we could not find (beyond the experimental error limits) any indications of the first - order phase transformation that had been detected earlier in the dilatometric investigation of the orientational N2-C60 glass. A possible explanation of this fact is proposed.
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