Studies on the thermodynamics of the C[sub 60]-C[sub 70] binary system

Journal Article · Thu Jan 27 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100055a047· OSTI ID:5065547

Baba, M S; Narasimhan, T S.L.; Balasubramanian, R; Sivaraman, N; Mathews, C K ^[1]

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1. Indira Gandhi Centre for Atomic Research, Tamil Nadu (India)

Partial pressures of C[sub 60] and C[sub 70] were measured as a function of temperature at several compositions from pure C[sub 60] to pure C[sub 70] in the C[sub 60]-C[sub 70] binary system. The measurements were carried out in the temperature range 600-800 K by using Knudsen effusion mass spectrometry. The pressure-temperature-composition data suggest that the two fullerenes are soluble in each other in the solid state to the extent of about 30%, with a miscibility gap in between. A binary phase diagram is reported on the basis of these studies. The partial pressures of both C[sub 60] and C[sub 70] in equilibrium with fullerite were also measured as a function of temperature. The enthalpy and entropy of vaporization of each species are derived from the pressure-temperature data for every solid phase studied. The thermodynamic data suggest that C[sub 60] and C[sub 70] are more strongly bound in fullerite than in the solid solution or in the pure phases. This indicates the influence of higher fullerenes. 28 refs., 11 figs., 10 tabs.

• OSTI ID: 5065547
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:4; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY MIXTURES
CARBON
CHEMICAL BONDS
COMPILED DATA
DATA
DIAGRAMS
DISPERSIONS
ELEMENTS
ENTHALPY
ENTROPY
EQUILIBRIUM
EVAPORATION
FLUID FLOW
FULLERENES
GAS FLOW
INFORMATION
KNUDSEN FLOW
MASS SPECTROSCOPY
MIXTURES
NONMETALS
NUMERICAL DATA
PARTIAL PRESSURE
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SOLID SOLUTIONS
SOLUBILITY
SOLUTIONS
SPECTROSCOPY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES