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Thermal studies of C60 transformed by temperature and pressure treatments

✍ Scribed by A. Dworkin; H. Szwarc; V.A. Davydov; L.S. Kashevarova; A.V. Rakhmanina; V. Agafonov; R. Céolin

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
332 KB
Volume
35
Category
Article
ISSN
0008-6223

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✦ Synopsis

Samples of fullerene CsO submitted previously to temperatures and pressures up to 973 K and 9.5 GPa have been heated in a differential scanning calorimeter in the interval 220-725 K. In nearly all of them, the first heating showed an irreversible endothermic peak extending between 450 and 550 K which was interpreted as a depolymerization reaction. Subsequent heating of the resulting products often revealed the presence of a double endothermic peak between 270 and 300 K and/or the characteristic transition peak of [60] fullerene around 250 K. All these facts have been taken as the consequences of depolymerization of the initial samples. Where the endothermic peak was not observed, no [60] fullerene was produced. In one case a glass transition appeared.

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