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| Home > Publications database > Synthesis and characterization of crystalline polymeric carbonic acid (H$_2$CO$_3$) with sp$^{3-}$hybridized carbon at elevated pressures |
| Journal Article | PUBDB-2025-03831 |
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2025
Macmillan Publishers Limited, part of Springer Nature
[London]
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Please use a persistent id in citations: doi:10.1038/s42004-025-01614-y doi:10.3204/PUBDB-2025-03831
Abstract: The existence of polymeric carbonic acid (H$_2$CO$_3$) at elevated pressures has been predicted, but has not been investigated experimentally. Here, polymeric carbonic acid containing sp3-hybridized carbon was synthesized and characterized at ≈40 GPa. H$_2$CO$_3$ single crystals were obtained by laser-heating a H$_2$O + CO$_2$ mixture in a diamond anvil cell. The orthorhombic crystal structure (Cmc2$_1$ with Z = 4) was refined from synchrotron single crystal X-ray diffraction data and is in agreement with a structural model predicted earlier. The crystal structure of H$_2$CO$_3$-Cmc2$_1$ is characterized by $[CO_4]^{4-}$ building blocks which are connected via corner sharing, forming chains along the c-axis. The combination of single crystal X-ray data with experimental Raman spectroscopy and DFT-calculations confirms that the structural model of H$_2$CO$_3$-Cmc2$_1$ is appropriate. The synthesis condition of polymeric carbonic acid points towards its potential existence in ice giants including the ones present in our solar system.
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