Orientation of OH groups in kaolinite and dickite: Ab initio molecular dynamics study

L. Benco, D. Tunega, J. Hafner, H. Lischka

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Ab-initio density-functional molecular dynamics simulations and full relaxation of all atomic positions are used to reconcile the crystal structures with IR spectra of dickite and kaolinite. The relaxation of atomic positions preserves the accepted space group symmetries. A pair of two hydroxyl groups oriented parallel to the layer is formed in structures of both dickite and kaolinite producing the high-frequency components of the OH-stretching frequencies. Other hydroxyls make relatively strong interlayer hydrogen bonds and produce down-shifted stretching bands. All hydroxyl groups are involved in effective hydrogen bonds. The OH-streching frequencies depend linearly on the strength of the hydrogen bond.

Original languageEnglish
Pages (from-to)1057-1065
Number of pages9
JournalAmerican Mineralogist
Volume86
Issue number9
DOIs
StatePublished - 2001

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