Physics and Chemistry of Minerals

, Volume 45, Issue 1, pp 59–68 | Cite as

The high-pressure behavior of spherocobaltite (CoCO3): a single crystal Raman spectroscopy and XRD study

  • Stella Chariton
  • Valerio Cerantola
  • Leyla Ismailova
  • Elena Bykova
  • Maxim Bykov
  • Ilya Kupenko
  • Catherine McCammon
  • Leonid Dubrovinsky
Original Paper


Magnesite (MgCO3), calcite (CaCO3), dolomite [(Ca, Mg)CO3], and siderite (FeCO3) are among the best-studied carbonate minerals at high pressures and temperatures. Although they all exhibit the calcite-type structure (\({\text{R}}\bar{3}{\text{c}}\)) at ambient conditions, they display very different behavior at mantle pressures. To broaden the knowledge of the high-pressure crystal chemistry of carbonates, we studied spherocobaltite (CoCO3), which contains Co2+ with cation radius in between those of Ca2+ and Mg2+ in calcite and magnesite, respectively. We synthesized single crystals of pure spherocobaltite and studied them using Raman spectroscopy and X-ray diffraction in diamond anvil cells at pressures to over 55 GPa. Based on single crystal diffraction data, we found that the bulk modulus of spherocobaltite is 128 (2) GPa and K′ = 4.28 (17). CoCO3 is stable in the calcite-type structure up to at least 56 GPa and 1200 K. At 57 GPa and after laser heating above 2000 K, CoCO3 partially decomposes and forms CoO. In comparison to previously studied carbonates, our results suggest that at lower mantle conditions carbonates can be stable in the calcite-type structure if the radius of the incorporated cation(s) is equal or smaller than that of Co2+ (i.e., 0.745 Å).


Spherocobaltite CoCO3 High pressure X-ray diffraction Raman spectroscopy Transition metal carbonates 



We thank the European Synchrotron Radiation Facility for provision of synchrotron radiation (ID09A) and Michael Hanfland for additional technical assistance. We also thank Tiziana Boffa-Ballaran for help with data analysis software and Alexander Kurnosov for the gas loading of diamond anvil cells. The project was supported by funds from the German Science Foundation (DFG) through the CarboPaT Research Unit FOR2125 (Mc3/20, Du393/9), the German Federal Ministry for Education (BMBF), and the German Academic Exchange Service (DAAD).


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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Bayerisches GeoinstitutUniversitat BayreuthBayreuthGermany
  2. 2.European Synchrotron Radiation FacilityGrenobleFrance
  3. 3.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia
  4. 4.Deutsches Electronen SynchrotronHamburgGermany
  5. 5.Institute for MineralogyUniversitat MünsterMünsterGermany

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