Stability and breakdown of Ca¹³CO₃ melt associated with formation of ¹³C-diamond in static high pressure experiments up to 43 GPa and 3900 K

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Spivak, Anna V. ; Litvin, Yu. A. ; Ovsyannikov, Sergey V. ; Dubrovinskaia, Natalia ; Dubrovinsky, Leonid:
Stability and breakdown of Ca¹³CO₃ melt associated with formation of ¹³C-diamond in static high pressure experiments up to 43 GPa and 3900 K.
In: Journal of Solid State Chemistry. Bd. 191 (2012) . - S. 102-106.
ISSN 0022-4596
DOI: https://doi.org/10.1016/j.jssc.2012.02.041

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Abstract

Melting of calcium carbonate Ca13CO3, stability of the melt and its decomposition were studied in static high pressure experiments at pressures of 11–43 {GPa} and temperatures of 1600–3900 K using diamond anvil cell technique with laser heating. We observed formation of 13C-graphite (below 16 GPa) and 13C-diamond (between 16 and 43 GPa) on decomposition of the Ca13CO3 melt at temperatures above 3400 K. At temperatures below 3400 K congruent melting of calcium carbonate was confirmed. The experimental results were applied to construction of the phase diagram of CaCO3 up to 43 {GPa} and 3900 K focusing at the melting curve of calcium carbonate and the decomposition phase boundary of CaCO3 melt.