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
