A comparative Raman study of some transition metal fullerides

• Published in: Thin solid films 2003-04, Vol.429 (1), p.96-101
• Main Authors: Talyzin, A.V., Jansson, U.
• Format: Article
• Language: English
• Subjects: Composition and phase identification; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fullerene; Fullerenes and related materials; Fullerenes and related materials; diamonds, graphite; Infrared and raman spectra and scattering; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Noble metals; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics; Raman spectroscopy; Specific materials; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology; Transition metals; Vacuum deposition
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/S0040-6090(03)00278-5

Fe–C 60 films were obtained using co-evaporation of metal and C 60 from separate sources at UHV conditions. A new Fe x C 60 compound was identified based on the analysis of Raman spectra, which showed many new peaks as a well as a split, and shift of original C 60 modes. Fe x C 60 exhibits no homogeneity range and the composition was estimated to be approximately Fe 3–4C 60. The Fe-fulleride phase is stable in air, not soluble in toluene and most probably has a polymeric structure similar to known fullerides with Pt and Pd. Raman spectra of fulleride compounds with Nb, Fe, Pt and Pd were compared and found to exhibit strong similarities including characteristic peaks below 250 cm −1, which can be attributed to intercage vibrations of a polymeric structure. In contrast, Raman data as well as properties of a previously described Ti x C 60 phase suggest a different type of bonding in this compound.