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Formation of sp(3) hybridized bonds and stability of CaCO3 at very high pressure
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Condensed Matter Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Condensed Matter Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Condensed Matter Theory.
2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, no 26, 268501- p.Article in journal (Refereed) Published
Abstract [en]

By performing ab initio electronic structure calculations, we observed a new high-pressure phase transition within the Pmcn structure of CaCO3. This transition is characterized by the change of the carbon's sp hybridization state and is driven by the intrinsic property of the carbon atom to form tetrahedral covalent bonds at high pressure. The formation of sp(3) hybridized bonds explains the stability of MgCO3 and CaCO3 at Earth's lower mantle pressure conditions and may serve as a criterion for searching new possible high-pressure phases of carbon bearing minerals.

Place, publisher, year, edition, pages
2007. Vol. 98, no 26, 268501- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-145290DOI: 10.1103/PhysRevLett.98.268501ISI: 000247625100065OAI: oai:DiVA.org:uu-145290DiVA: diva2:396119
Available from: 2011-02-08 Created: 2011-02-08 Last updated: 2017-12-11Bibliographically approved

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Ahuja, Rajeev

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