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Title: Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [2];  [2];  [7]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. Carnegie Inst. of Washington, Washington, DC (United States)
  4. CEA Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, Beijing (China)
  5. Carnegie Inst. of Washington, Argonne, IL (United States)
  6. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Washington, DC (United States)
  7. Carnegie Inst. of Washington, Washington, DC (United States); Ehime Univ., Matsuyama (Japan)

Calcium carbonate (CaCO3) significantly affects the properties of upper mantle and plays a key role in deep carbon recycling. However, its phase relations above 3 GPa and 1000 K are controversial. Here we report a reversible temperature-induced aragonite-amorphization transition in CaCO3 at 3.9-7.5 GPa and temperature above 1000 K. Amorphous CaCO3 shares a similar structure as liquid CaCO3 but with much larger C-O and Ca-Ca bond lengths, indicating a lower density and a mechanism of lattice collapse for the temperature-induced amorphous phase. The less dense amorphous phase compared with the liquid provides an explanation for the observed CaCO3 melting curve overturn at about 6 GPa. Amorphous CaCO3 is stable at subduction zone conditions and could aid the recycling of carbon to the surface.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-05CH11231; NA0001974; AC02-06CH11357; FG02-99ER45775
OSTI ID:
1559210
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Microdynamic changes of moisture-induced crystallization of amorphous calcium carbonate revealed via in situ FTIR spectroscopy journal January 2019

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