Study of the Radiation Resistance of Endohedral Fullerenes of Rare-Earth Elements and Their Water-Soluble Derivatives

• Published in: Crystallography reports 2018-01, Vol.63 (1), p.132-138
• Main Authors: Dubovskii, I. M., Lebedev, V. T., Shilin, V. A., Szhogina, A. A., Suyasova, M. V., Sedov, V. P.
• Format: Article
• Language: English
• Subjects: ABSORPTION; Absorption cross sections; CADMIUM; COMPARATIVE EVALUATIONS; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CROSS SECTIONS; Crystallography and Scattering Methods; Derivatives; EUROPIUM; FAST NEUTRONS; FULLERENES; GAMMA RADIATION; IRRADIATION; MATERIALS SCIENCE; Metallofullerenes; Nanomaterials; Neutron absorption; NEUTRON FLUX; NEUTRON REACTIONS; Nuclear capture; Nuclei (nuclear physics); Physics; Physics and Astronomy; Radiation tolerance; Rare earth elements; Recoil; RECOILS; SAMARIUM; SLOW NEUTRONS; THERMAL NEUTRONS
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774518010054

Endohedral metallofullerenes Me @C 2 n ( n = 30–50), their hydroxylated derivatives Me @C 2 n (OH) 38–40 ( Me = Tm, Ho, Eu, Sm, Co), and fullerenol С 60 (OH) 38 have been synthesized The radiation resistance of these structures under irradiation in reactor by thermal and fast neutron fluxes in the fluence range of 1018–1019 cm –2 (cadmium ratio of ~10) has been analyzed. Endofullerenols are shown to be more stable in comparison with initial endohedral fullerenes; the molecules containing Eu and Sm (atoms characterized by the largest slow-neutron absorption cross section) turned out to be most stable. The mechanism of the formation of secondary Eu and Sm endofullerenols is discussed taking into account the neutron capture and emission of γ quanta by excited nuclei, which acquire the recoil energy.