caa a22 4500 47576191X CHVBK 20180406123553.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/BF02494672 doi (NATIONALLICENCE)springer-10.1007/BF02494672 Thermodynamic properties of some polymeric forms of fullerite C60 at temperatures ranging from 0 to 320 K [Elektronische Daten] [B. Lebedev, K. Zhogova, V. Blank, R. Bagramov] The temperature dependences of the heat capacityC 0 p of fullerites C60 were studied at temperatures ranging from 5 to 320 K in an adiabatic vacuum calorimeter with an accuracy of 0.4-0.2%. The fullerite C60 samples were prepared by treating the starting fullerite C60 under 8 GPa at 920 and 1270 K and "quenched” by a sharp decrease in pressure to −105 Pa and in temperature to ∼300 K. Fullerite C60(8 GPa, 920 K), a crystalline polymer with layered structure formed by polymerized fullerene C60 molecules, was obtained at 920 K and 8 GPa. Fullerite C60(8 GPa, 1270 K), a three-dimensional polymer with a graphite-like structure formed by fragments of decomposed C60 molecules and containing many C(sp3)−C(sp3) bonds, was obtained at 1270 K and 8 GPa. Both polymers are metastable polymeric phases. The anomalous character of the temperature dependence of the heat capacity was revealed in the 49-66 K range for the polymer formed at 1270 K. The thermodynamic functions of the substances under study were calculated for the 0-320 K region along with entropies of their formation from graphite. The entropies of transformation of the starting fullerite C60 into metastable phases and that of intertransformation of phases were estimated. Kluwer Academic/Plenum Publishers, 2000 fullerites C60(8 GPa, 920 K) and C60(8 GPa, 1270 K) nationallicence calorimetry, heat capacity nationallicence thermodynamic functions nationallicence entropies of intertransformation of phases nationallicence Lebedev B. Research Institute of Chemistry at the N. I. Lobachevsky Nizhnii Novgorod State University, 23 (5) prosp. Gagarina, 603600, Nizhnii Novgorod, Russian Federation aut Zhogova K. Research Institute of Chemistry at the N. I. Lobachevsky Nizhnii Novgorod State University, 23 (5) prosp. Gagarina, 603600, Nizhnii Novgorod, Russian Federation aut Blank V. Scientific Technical Center "Superhard Materials”, 7A ul. Tsentral'naya, 142092, Troitsk, Russian Federation aut Bagramov R. Scientific Technical Center "Superhard Materials”, 7A ul. Tsentral'naya, 142092, Troitsk, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/2(2000-02-01), 280-284 1066-5285 49:2<280 2000 49 11172 https://doi.org/10.1007/BF02494672 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02494672 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lebedev B. Research Institute of Chemistry at the N. I. Lobachevsky Nizhnii Novgorod State University, 23 (5) prosp. Gagarina, 603600, Nizhnii Novgorod, Russian Federation aut NATIONALLICENCE 700 1- Zhogova K. Research Institute of Chemistry at the N. I. Lobachevsky Nizhnii Novgorod State University, 23 (5) prosp. Gagarina, 603600, Nizhnii Novgorod, Russian Federation aut NATIONALLICENCE 700 1- Blank V. Scientific Technical Center "Superhard Materials”, 7A ul. Tsentral'naya, 142092, Troitsk, Russian Federation aut NATIONALLICENCE 700 1- Bagramov R. Scientific Technical Center "Superhard Materials”, 7A ul. Tsentral'naya, 142092, Troitsk, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/2(2000-02-01), 280-284 1066-5285 49:2<280 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer