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Title: Bulk properties of alkali doped C<sub>60</sub> solids
Authors: Ranjan, K
Dharamvir, K
Jindal, V K
Keywords: K<sub>n</sub>C<sub>60</sub>
Coulomb potential
Lattice constant
Cohesive energy
Bulk modulus
Issue Date: Sep-2005
Publisher: CSIR
Series/Report no.: C01B31/00
Abstract: The model calculations are presented for potassium, rubidium and cesium doped C<sub>60</sub> solids formed by exohedral doping in pure C<sub>60</sub> solid. The molecular formula is M<sub>n</sub>C<sub>60</sub>, M is the alkali metal (K, Rb and Cs) and <i style="">n</i> takes integer values 1, 3, 4 and 6.  The C<sub>60</sub> molecule is modelled as a uniform spherical shell having surface density of carbon atoms. Part of the electrons released by ionized alkali atoms distributed on the C<sub>60</sub> molecule making it an anion, while the rest (say <i style="">x</i>) are assumed to form a delocalised electron gas. This electron gas screens the Coulomb interaction between the various anion and cations. With these assumptions, the total cohesive energy is calculated taking into consideration Van der Waals and screened Coulomb interaction between different ions. We found that the total charge transfer from cation to anion is favoured. Thus ionic character of alkali doped C<sub>60</sub> solids is established on the basis of the model. The lattice constant, cohesive energy and Bulk modulus for these systems are in good agreement with other calculation or experimental observations. We make some remarks on phase stability of these solids.
Description: 654-659
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(09) [September 2005]

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