Intercalation of C 60 fullerite with helium and argon at normal temperature and pressure

• Published in: Low temperature physics (Woodbury, N.Y.) N.Y.), 2003-05, Vol.29 (5), p.445-448
• Main Authors: Stetsenko, Yu. E., Legchenkova, I. V., Yagotintsev, K. A., Prokhvatilov, A. I., Strzhemechnyı̆, M. A.
• Format: Article
• Language: English
• ISSN: 1063-777X; 1090-6517
• DOI: 10.1063/1.1542509

Powder x-ray diffractometry was used to study the effect of intercalating C 60 fullerite with helium and argon atoms on the fullerite structure. The samples were saturated at room temperature and normal pressure. The dependences obtained for the lattice parameter and half-width of certain reflections on the intercalation time with helium atoms showed that the voids in the C 60 lattice were filled in two stages. Helium filled the octahedral voids relatively rapidly first and then the tetrahedral subsystem, but much more slowly. Both intercalants affected the half-width and intensity of the reflections, the matrix lattice parameters, the phase transition temperature, the volume jump at the transition, and the thermal expansion coefficients of C 60 fullerite.