Potassium-doped fullerene KχC60 with X = 0, 1, 2, 3, 4, and 6

Winter, J.; Kuzmany, H.

doi:10.1016/0038-1098(92)90796-c

Cited by 202 publications

(76 citation statements)

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“…In both materials the onset of spectral weight is found at lower energy than that in C 60 . The oberserved onsets in the spectra at 1.2 and 1.4 eV for o-Rb 1 C 60 and for (C 59 N) 2 , respectively, are in good agreement with optical measurements and calculations. Additionally in contrast to [11], no structure either from a Drude plasmon or from an interband transition is observed for the o-Rb 1 C 60 polymer between 0.4 and 1.2 eV, as it is also expected from the IR-reflectivity measurements and optical absorption measurements.…”

Section: Resultssupporting

confidence: 84%

“…Fig. 1 shows a comparison of the C 1s excitation spectra of C 60 , (C 59 N) 2 and o-Rb 1 C 60 . The data are normalised to the intensity of the σ* onset at 290.5 eV.…”

Section: Methodsmentioning

confidence: 99%

“…The stable phase A 1 C 60 was first observed at elevated temperatures using Raman spectroscopy in the case of K 1 C 60 [2]. This x = 1 phase was found to crystallize at elevated temperature in an fcc lattice [3] and upon cooling to undergo either a first order phase transition into an orthorhombic o-A 1 C 60 phase for (A=Rb, Cs) [4], or to phase separate into pristine C 60 and K 3 C 60 , as has been verified by photoemission (PES) [5], Raman and infrared (IR) spectroscopy [2,6]. In addition, a metastable orthorhombic room temperature phase of K 1 C 60 was observed at high cooling rates [7].…”

mentioning

confidence: 99%

“…The synthesis and isolation of bulk quantities of the first so-called heterofullerene, (C 59 N) 2 [15], have recently allowed the first analysis of the physical and chemical properties of these dimers in the solid state. The crystal structure of pristine (C 59 N) 2 has been studied [16,17] by x-ray diffraction on sublimed material (i.e.…”

mentioning

confidence: 99%

“…Therefore, (C 59 N) 2 is the first example of a stable fullerene dimer. Interestingly, intercalation of (C 59 N) 2 with potassium leads to a phase K 6 C 59 N, isostructural to K 6 C 60 , with the heterofullerene molecules separated in monomers [24].…”

mentioning

confidence: 99%

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The electronic structure of polymerized fullerenes and dimerized heterofullerenes

Pichler

Knupfer²,

Golden³

et al. 1997

Applied Physics A: Materials Science & Processing

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The electronic structure of polymerized fullerenes and dimerized heterofullerenes Pichler, T.; Knupfer, M.; Golden, M.S.; Fink, J.; Winter, J; Haluska, M.; Kuzmany, H.; Keshavarz, K.; Bellavia-Lund, C.; Sastre, A. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Abstract. We present studies of the electronic structure of polymerized orthorhombic Rb 1 C 60 and dimerised C 59 N using electron energy-loss spectroscopy in transmission. From the C1s excitation spectra a reduced density of π* states is observed for polymerized Rb 1 C 60 . This is in contrast to (C 59 N) 2 and can be explained by the different type of 'doping' and by the different bonding between the fullerene molecules in the two systems. Additional information about the optical properties was obtained from the low energy loss function. Using a Kramers-Kronig analysis, the dielectric function, (ε), and the optical conductivity, (σ), have been derived. ε(0) and the onset of the spectral weight have been compared between the polymer, the dimer and C 60 . This onset of spectral weight is found to be at 1.2 and 1.4 eV for o-Rb 1 C 60 and for (C 59 N) 2 , respectively.

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Section: Resultssupporting

confidence: 84%

“…Fig. 1 shows a comparison of the C 1s excitation spectra of C 60 , (C 59 N) 2 and o-Rb 1 C 60 . The data are normalised to the intensity of the σ* onset at 290.5 eV.…”

Section: Methodsmentioning

confidence: 99%