Carbon enters silica forming a cristobalite-type CO2–SiO2 solid solution

Mario Santoro (), Federico A. Gorelli, Roberto Bini, Ashkan Salamat, Gaston Garbarino, Claire Levelut, Olivier Cambon and Julien Haines ()
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Mario Santoro: Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR)
Federico A. Gorelli: Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR)
Roberto Bini: European Laboratory for Non-Linear Spectroscopy (LENS)
Ashkan Salamat: European Synchrotron Radiation Facility
Gaston Garbarino: European Synchrotron Radiation Facility
Claire Levelut: Laboratoire Charles Coulomb, UMR 5221, Centre National de la Recherche Scientifique (CNRS), Verres et Nanomatériaux (CVN), Université Montpellier 2
Olivier Cambon: Institut Charles Gerhardt Montpellier, UMR 5253, Centre National de la Recherche Scientifique (CNRS), Equipe C2M, Université Montpellier 2
Julien Haines: Institut Charles Gerhardt Montpellier, UMR 5253, Centre National de la Recherche Scientifique (CNRS), Equipe C2M, Université Montpellier 2

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Extreme conditions permit unique materials to be synthesized and can significantly update our view of the periodic table. In the case of group IV elements, carbon was always considered to be distinct with respect to its heavier homologues in forming oxides. Here we report the synthesis of a crystalline CO2–SiO2 solid solution by reacting carbon dioxide and silica in a laser-heated diamond anvil cell (P=16–22 GPa, T>4,000 K), showing that carbon enters silica. Remarkably, this material is recovered to ambient conditions. X-ray diffraction shows that the crystal adopts a densely packed α-cristobalite structure (P41212) with carbon and silicon in fourfold coordination to oxygen at pressures where silica normally adopts a sixfold coordinated rutile-type stishovite structure. An average formula of C0.6(1)Si0.4(1)O2 is consistent with X-ray diffraction and Raman spectroscopy results. These findings may modify our view on oxide chemistry, which is of great interest for materials science, as well as Earth and planetary sciences.

Date: 2014
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DOI: 10.1038/ncomms4761

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