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- W2012161829 abstract "The Raman spectra of thin films of C60 were recorded as a function of potassium coverage under ultrahigh vacuum conditions. Both clean and air-exposed C60 films were studied. The growth of the K3C60 and K6C60 phases are observed but no spectroscopic evidence of a K4C60 phase is found. The spectra indicate that potassium and C60 co-exist as distinct C60, K3C60 and K6C60 phases as opposed to solid solutions with variable dopant concentrations. Facile potassium diffusion into vacuum-sublimed C60 films is observed even at 50 K resulting in the formation of K3C60 and K6C60. The electrical resistivity of films were recorded in situ at 373 K as a function of K exposure. Raman spectra recorded periodically at various levels of K exposure and at multiple locations on the film indicate that the doped C60 films are granular with average grain sizes of the order of one to several micrometers. The occasional simultaneous detection by Raman of all three phases indicates that a small quantity of undoped C60 remains even at levels of potassium exposure sufficiently high to form K6C60. This implies that while potassium infiltration into C60 crystallites is rapid, intercrystallite potassium exchange is slow." @default.
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- W2012161829 date "1995-03-01" @default.
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- W2012161829 title "The spatially resolved composition of K-doped C60 films" @default.
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- W2012161829 doi "https://doi.org/10.1016/0040-6090(94)05705-2" @default.
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