EXAFS study of Br2-graphite intercalation compounds

S. M. Heald; E. A. Stern

doi:10.1016/0379-6779(80)90014-4

EXAFS study of Br₂-graphite intercalation compounds

S. M. Heald, E. A. Stern

University of Washington

Research output: Contribution to journal › Article › peer-review

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Abstract

Extended X-ray absorption fine structure (EXAFS) measurements are presented for dilute graphite-Br₂ intercalation compounds containing 0.27 mole % and 0.75 mole % Br₂. Intercalated Br₂ molecules are found to have a BrBr distance of 2.34 ± 0.02 A ̊ and predominate in the 0.75% sample. A unique feature of the present work is the discovery of another type of bromine molecule with a BrBr distance of 2.53 ± 0.03 A ̊. This molecule seems to be associated with defect or edge sites and predominates in the 0.27% sample. It is reasonable to speculate that this molecule acts like a "can opener", preparing the graphite planes for intercalation. The implication of these results with respect to charge transfer is discussed, and it is estimated that roughly 0.16 electrons are transferred to each intercalated molecule, while ∼0.6 electrons are transferred to each "can opener" molecule.

Original language	English
Pages (from-to)	249-255
Number of pages	7
Journal	Synthetic Metals
Volume	1
Issue number	3
DOIs	https://doi.org/10.1016/0379-6779(80)90014-4
State	Published - Apr 1980
Externally published	Yes

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title = "EXAFS study of Br2-graphite intercalation compounds",

abstract = "Extended X-ray absorption fine structure (EXAFS) measurements are presented for dilute graphite-Br2 intercalation compounds containing 0.27 mole % and 0.75 mole % Br2. Intercalated Br2 molecules are found to have a BrBr distance of 2.34 ± 0.02 A ̊ and predominate in the 0.75% sample. A unique feature of the present work is the discovery of another type of bromine molecule with a BrBr distance of 2.53 ± 0.03 A ̊. This molecule seems to be associated with defect or edge sites and predominates in the 0.27% sample. It is reasonable to speculate that this molecule acts like a {"}can opener{"}, preparing the graphite planes for intercalation. The implication of these results with respect to charge transfer is discussed, and it is estimated that roughly 0.16 electrons are transferred to each intercalated molecule, while ∼0.6 electrons are transferred to each {"}can opener{"} molecule.",

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AU - Heald, S. M.

AU - Stern, E. A.

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N2 - Extended X-ray absorption fine structure (EXAFS) measurements are presented for dilute graphite-Br2 intercalation compounds containing 0.27 mole % and 0.75 mole % Br2. Intercalated Br2 molecules are found to have a BrBr distance of 2.34 ± 0.02 A ̊ and predominate in the 0.75% sample. A unique feature of the present work is the discovery of another type of bromine molecule with a BrBr distance of 2.53 ± 0.03 A ̊. This molecule seems to be associated with defect or edge sites and predominates in the 0.27% sample. It is reasonable to speculate that this molecule acts like a "can opener", preparing the graphite planes for intercalation. The implication of these results with respect to charge transfer is discussed, and it is estimated that roughly 0.16 electrons are transferred to each intercalated molecule, while ∼0.6 electrons are transferred to each "can opener" molecule.

AB - Extended X-ray absorption fine structure (EXAFS) measurements are presented for dilute graphite-Br2 intercalation compounds containing 0.27 mole % and 0.75 mole % Br2. Intercalated Br2 molecules are found to have a BrBr distance of 2.34 ± 0.02 A ̊ and predominate in the 0.75% sample. A unique feature of the present work is the discovery of another type of bromine molecule with a BrBr distance of 2.53 ± 0.03 A ̊. This molecule seems to be associated with defect or edge sites and predominates in the 0.27% sample. It is reasonable to speculate that this molecule acts like a "can opener", preparing the graphite planes for intercalation. The implication of these results with respect to charge transfer is discussed, and it is estimated that roughly 0.16 electrons are transferred to each intercalated molecule, while ∼0.6 electrons are transferred to each "can opener" molecule.

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EXAFS study of Br₂-graphite intercalation compounds

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