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Showing 1–4 of 4 results
Advanced filters: Author: Dominik Spahr Clear advanced filters

  • It is well established that a significant amount of heat produced in the Earth’s mantle is due to the decay of uranium, yet the incorporation of uranium in deep mantle phases remains poorly explored. Here, two chemically simple uranium carbonates (U2[CO3]3 and U[CO3]2) were synthesized by a reaction of UO2 with CO2 at lower mantle conditions, revealing that uranium carbonates could be host phases of uranium in carbon-rich lithologies in the Earth’s mantle.

    • Dominik Spahr
    • Lkhamsuren Bayarjargal
    • Björn Winkler
    ResearchOpen Access
    Communications Chemistry
    P: 1-7

  • Crystal structure predictions have proposed the existence of polymeric H2CO3, but its high-pressure polymorphism has yet to be confirmed experimentally. Here, the authors synthesized single crystals of polymeric H2CO3 in a diamond anvil cell and demonstrated that its structure consists of polymerized \({[{{\rm{CO}}}_{4}]}^{4-}\) tetrahedra forming chains along the c-axis.

    • Dominik Spahr
    • Lkhamsuren Bayarjargal
    • Elena Bykova
    ResearchOpen Access
    Communications Chemistry
    Volume: 8, P: 1-7

  • Carbonates are transported into the deep Earth by subduction of the oceanic lithosphere, but the stability fields of subducted carbonates as a function of pressure, temperature, and composition remain incompletely described. Here, the authors synthesize the anhydrous, mixed pyrocarbonate Ca3[C2O5]2[CO3] from Ca[CO3] and CO2 in a laser-heated diamond anvil cell at moderate pressure and elucidate its structural features.

    • Dominik Spahr
    • Lkhamsuren Bayarjargal
    • Björn Winkler
    ResearchOpen Access
    Communications Chemistry
    Volume: 7, P: 1-7

  • Geochemically relevant [C4O10]4- pyramids are the most polymerized high pressure carbonate units, with Mn-, Cd-, Ca- and Ba-based structures reported to date. Here, the authors synthesized an Fe-carbonate featuring [C4O10]4- anions with a predicted high-to-low-spin crossover at unusually high pressure near 95 GPa.

    • Valentin Kovalev
    • Dominik Spahr
    • Elena Bykova
    ResearchOpen Access
    Communications Chemistry
    Volume: 8, P: 1-11