A simple low-temperature adiabatic calorimeter for small samples

Bagatskii, M. I.; Sumarokov, V. V.; Долбин, А. В.

doi:10.1063/1.3605700

Cited by 16 publications

(34 citation statements)

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“…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].…”

Section: Introductionmentioning

confidence: 59%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…The heat capacity of C 60 was investigated below 4 K [21][22][23]25]. Beyermann et al [22,23] performed two series of C p (T) measurements.…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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The low-temperature heat capacity of fullerite C60

Bagatskii

Sumarokov

Barabashko

et al. 2015

Low Temperature Physics

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PostprintThis is the accepted version of a paper published in Low temperature physics (Woodbury, N.Y., Print). This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Bagatskii, M., Sumarokov, V., Barabashko, M., Dolbin, A V., Sundqvist, B. (2015) The low-temperature heat capacity of fullerite C 60 . Abstract:The heat capacity at constant pressure of fullerite C 60 has been investigated using an adiabatic calorimeter in a temperature range from 1.2 to 120 K. Our results and literature data have been analyzed in a temperature interval from 0.2 to 300 K. The contributions of the intramolecular and lattice vibrations into the heat capacity of C 60 have been separated. The contribution of the intramolecular vibration becomes significant above 50 K. Below 2.3 K the experimental temperature dependence of the heat capacity of C 60 is described by linear and cubic terms. The limiting Debye temperature at T → 0 K has been estimated (Θ 0 = 84.4 K). In the interval from 1.2 to 30 K the experimental curve of the heat capacity of C 60 describes the contributions of rotational tunnel levels, translational vibrations (in the Debye model with Θ 0 = 84.4 K), and librations (in the Einstein model with Θ E,lib = 32.5 K). It is shown that the experimental temperature dependences of heat capacity and thermal expansion are proportional in the region from 5 to 60 K. The contribution of the cooperative processes of orientational disordering becomes appreciable above 180 K. In the high-temperature phase the lattice heat capacity at constant volume is close to 4.5 R, which corresponds to the hightemperature limit of translational vibrations (3 R) and the near-free rotational motion of C 60 molecules (1.5 R).

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Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

“…The heat capacity of C 60 was investigated below 4 K [21][22][23]25]. Beyermann et al [22,23] performed two series of C p (T) measurements.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The low-temperature heat capacity of fullerite C60

Bagatskii

Sumarokov

Barabashko

et al. 2015

Low Temperature Physics

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Thermal Methods

Johnson

White

2013

Multi Length‐Scale Characterisation

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Heat Capacity of 1D Chains of Atom/Molecule Adsorbates in the Grooves of c-SWNT Bundles

Sumarokov

Bagatskii

Barabashko

2014

Springer Proceedings in Physics

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Since the discovery of carbon nanotubes in 1991 [1], investigations of the physical properties of these novel materials have been rated as a fundamentally important trend in physics of condensed matter [2,3]. Of special interest is the study of properties of low-dimensional systems [4][5][6][7][8][9]. The unique structure of bundles of single-walled carbon nanotubes (SWNTs) permits obtaining quasi-one-dimensional (1D), 2D, and 3D structures formed by adsorbates [5,10]. Technologically, most of the nanotubes in the prepared bundles have closed ends unless special steps are taken to open them. Figure 15.1 demonstrates the possible sites of adsorption of a relatively small admixture atoms or molecules in a bundle of closed SWNTs (c-SWNTs): interstitial channels (IC), grooves (G) at the outer surface, and the outer surface (OS). These positions differ in geometrical size and energy of adsorbate binding to c-SWNT bundles [11]. At low adsorbate concentrations, quasi-1D chains of admixture atoms/molecules are formed in the IC-and G-sites. One or several layers of atoms/molecules adsorbed at the OS of the c-SWNT bundle form quasi-2D or quasi-3D systems. The 1D, 2D, and 3D systems have different properties at low temperatures [12][13][14][15][16][17][18][19]. Physical properties (adsorption, thermal, and structural) of simple gas admixtures deposited in c-SWNT bundles were investigated in experimental and theoretical works [5, 6, 9-11, 15, 20-39].The heat capacity of 4 He adsorbed on c-SWNT bundles was investigated at temperatures below 6 K [6,33]. It was observed [6] that the heat capacity of the adsorbed helium exhibited the behavior of 1D and 2D structures depending on the technique of sample preparation (laser evaporation or arc discharge). Structures of 4 He adsorbates in the grooves and at the OS of c-SWNT bundles were studied by the neutron diffraction method [18]. At low coverage, the 4 He atoms formed a 1D single line lattice along the grooves. As the concentration of the adsorbed helium atoms increased,

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A simple low-temperature adiabatic calorimeter for small samples

Cited by 16 publications

References 4 publications

The low-temperature heat capacity of fullerite C60

The low-temperature heat capacity of fullerite C60

Thermal Methods

Heat Capacity of 1D Chains of Atom/Molecule Adsorbates in the Grooves of c-SWNT Bundles

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