C60-C70-C6H5CH3 crystal solvates: Structure and thermal stability

Lad’yanov, V. I.; Ніконова, Р. М.

doi:10.1134/s0036024408130086

Cited by 8 publications

(4 citation statements)

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“…Heat treatment of the samples at temperatures of 150-200°C resulted in loss of solvated toluene mole cules [14] well below the annealing temperature adopted in this paper.. The subsequent annealing of C 70 and C 60/70 specimens led to gradual disappearance of the hcp phase according to the XRD analysis.…”

Section: Resultsmentioning

confidence: 73%

X-ray diffraction and UV/Vis spectroscopic study on thermal stability of fullerenes/fullerites

Ніконова

Merzlyakova

Lad’yanov

et al. 2012

Inorg. Mater. Appl. Res.

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The thermal stability of the fullerites C 60 , C 70 and alloy C 60/70 has been investigated by the X ray structural analysis after annealing in CO. It has been established the critical temperature stability of the mol ecule structure (the fullerenes) by the ultraviolet spectroscopy at the similar conditions. It has been shown that destruction of the fullerenes/fullerites take place in narrow range and depends on the type of the fullerenes. The fullerene C 70 is higher stability than that of C 60 . The initial decomposition temperature of the mixture C 60/70 , obtained extraction from toluene solution, is lower than that of C 60 and C 70 . It has been estab lished that the critical decomposition temperature of the fullerenes/fullerites is depends on the presence of impurities (oxygen and solvent). It has been shown that crystallization of the fullerenes from gaseous phase is the most advantageous method of cleaning.

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Section: Resultsmentioning

confidence: 73%

X-ray diffraction and UV/Vis spectroscopic study on thermal stability of fullerenes/fullerites

Ніконова

Merzlyakova

Lad’yanov

et al. 2012

Inorg. Mater. Appl. Res.

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“…The increase is probably caused by the formation of two types of solid substitution solutions, C 60 (C 70 ) and C 70 (С 60 ) based on С 60 and C 70 , respectively [18,19], or by the presence of various impurities, in particular, oxygen [8,22]. In addition, some part of the solvent remains in fullerite in the form of crystal solvates during crystallization from solution [23].…”

Section: Resultsmentioning

confidence: 99%

“…1d) shows weak lines of C 60 -C 70 -(С 6 Н 5 СН 3 ) n solvates (2θ = 8.4° and 18.7°), which decompose during further heatings to 180-200°С [23]. The C 60/70 mixture obtained without further puri fication from solution is characterized by the presence of many phases in the system (fcc С 60 , fcc C 70 , hcp C 70 , C 60 -C 70 -(С 6 Н 5 СН 3 ) n crystal solvates, and С 60 (C 70 ) and C 70 (С 60 ) solid substitution solutions).…”

Section: Resultsmentioning

confidence: 99%

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Thermal behavior of a mixture of fullerenes and fullerites C60/70

Ніконова

Merzlyakova

Lad’yanov

et al. 2012

Russ. J. Phys. Chem.

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The thermal behavior of a mixture of fullerites C 60/70 was studied by X ray diffraction and IR and UV spectroscopy. The temperature range in which the molecular and crystal states degrade was determined (825-875°C in a CO medium). In the C 60/70 mixture, fullerenes decomposed at lower temperatures than in pure C 60 and C 70 ; the decomposition temperature depended on the impurity (oxygen and solvent) content.

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