DOI: 10.1039/d6ra06420e ISSN: 2046-2069
Polymorphism of carbonic acid (H 2 CO 3 ) at low pressures
Dominik Spahr, Lukas Brüning, Lars Ehm, Lkhamsuren Bayarjargal, Maxim Bykov, Victor Milman, Vitali B. Prakapenka, Stella Chariton, Zhenxian Liu, Björn Winkler, Elena BykovaH 2 CO 3 - Pnma is a low temperature carbonic acid polymorph, which can occur at the same pressure (∼9 GPa) than the high-temperature phase H 2 CO 3 - P 2 1 / n . The crystal structure of H 2 CO 3 - Pnma was refined from synchrotron single crystal diffraction data.