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High-pressure phase transformations in carbonates
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 18, 184115- p.Article in journal (Refereed) Published
Abstract [en]

High-pressure phase transitions sequences in CaCO3, SrCO3, and BaCO3 are studied by first-principle electronic structure calculations. Each of the carbonates undergoes the aragonite to postaragonite phase transition with pressure in agreement with the experimental observation of Ono et al. However, the postaragonite to post-postaragonite phase transition, predicted by Oganov et al. and later observed in CaCO3, is unlikely to occur in SrCO3 and BaCO3. Hence, the concept that isostructural compounds will exhibit the same type of pressure-induced phase transitions has limitations. A change of the hybridization of the carbon atom from sp(2) to sp(3) within the Pmcn phase occurs in each of compounds, thus the carbonates are likely to transform at very high pressure to structures with tetrahedral CO4-4 carbonate group.

Place, publisher, year, edition, pages
2010. Vol. 82, no 18, 184115- p.
Keyword [en]
generalized gradient approximation, aragonite plus magnesite, augmented-wave method, earths lower mantle, crystal-structure, high-temperature, caco3, strontianite, transition, stability
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-27938DOI: 10.1103/PhysRevB.82.184115ISI: 000284462200002ScopusID: 2-s2.0-78649692114OAI: diva2:383264
Swedish Research Council
QC 20110104Available from: 2011-01-04 Created: 2011-01-03 Last updated: 2011-01-04Bibliographically approved

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Ahuja, Rajeev
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