The heat capacity of solid C60

The low-temperature heat capacity of fullerite C60

“…The experimental results on the specific heat C p (T) of fullerite C 60 and the literature data [16][17][18][19][20][21][22][23][24][25] are illustrated in Fig. 1 for the temperature regions 0.2-300 K (a), 0.2-120 K (b) and 0.2-50 K (c) in the log-log scale representation.…”

“…Therefore their C p (T) differs significantly in value and behavior from the results in [16][17][18][19][20][21][22][23][24]. The systematic discrepancy between both the curves C p (T) and the T c -values taken on heating the samples in adiabatic calorimeters [16][17][18][19][20][21] are due to the variations in the purity [16,17,28] and perfection [20] of the samples. The systematic scatter of the data on the thermodynamic properties of C 60 is also caused by the influence of the temperature prehistory of the samples and by thermocycling [29][30][31].…”

“…In interval from 4 to 160 K the discrepancy between the data in [16][17][18][19][20][21][22][23] is within 25%. The data in [24] are 50-100% over those in [16][17][18][19][20][21][22][23]. Olson et al [25] investigated a solid ~15% C 70 -C 60 mixture.…”

“…Since the discovery of the fullerite molecule C 60 [1], the low-temperature physical properties of fullerite C 60 have been investigated by various methods: inelastic neutron scattering [2,3], infrared and Raman spectroscopy [4,5], x-ray [3,6,7], neutron [8] and electron [9,10] diffraction, NMR [11], dilatometry [12][13][14][15] and calorimetry [16][17][18][19][20][21][22][23][24][25]. It has found that fullerite C 60 is a molecular crystal in which the molecules are bonded by the van der Waals forces and its physical properties are largely determined by the dynamics of the rotational motion of the C 60 molecules.…”

“…16, 17 (at a temperature range 11-300 K), [18] (13-300 K), [19] (5-340 K), [20] (6-350 K), [21] (1.2-30 K) and by thermal relaxation method in [22,23] (1.4-20 K), [24] (4-300 K) and [25] (0.2-190 K). In interval from 4 to 160 K the discrepancy between the data in [16][17][18][19][20][21][22][23] is within 25%. The data in [24] are 50-100% over those in [16][17][18][19][20][21][22][23].…”