Document Detail

Silicon carbonate phase formed from carbon dioxide and silica under pressure.
MedLine Citation:
PMID:  21518903     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The discovery of nonmolecular carbon dioxide under high-pressure conditions shows that there are remarkable analogies between this important substance and other group IV oxides. A natural and long-standing question is whether compounds between CO(2) and SiO(2) are possible. Under ambient conditions, CO(2) and SiO(2) are thermodynamically stable and do not react with each other. We show that reactions occur at high pressures indicating that silica can behave in a manner similar to ionic metal oxides that form carbonates at room pressure. A silicon carbonate phase was synthesized by reacting silicalite, a microporous SiO(2) zeolite, and molecular CO(2) that fills the pores, in diamond anvil cells at 18-26 GPa and 600-980 K; the compound was then temperature quenched. The material was characterized by Raman and IR spectroscopy, and synchrotron X-ray diffraction. The experiments reveal unique oxide chemistry at high pressures and the potential for synthesis of a class of previously uncharacterized materials. There are also potential implications for CO(2) segregation in planetary interiors and for CO(2) storage.
Mario Santoro; Federico Gorelli; Julien Haines; Olivier Cambon; Claire Levelut; Gaston Garbarino
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Publication Detail:
Type:  Journal Article     Date:  2011-04-25
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  108     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-05-11     Completed Date:  2011-07-15     Revised Date:  2011-11-10    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7689-92     Citation Subset:  -    
European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy.
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