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In their letter, Datchi et al. (1) question (i) the recoverability of CO2-V at low pressure and (ii) the identification of CO2-V as a Pna21 structure in our paper (2). We argue below that both of Datchi et al.’s (1) claims are incorrect. Regarding Datchi et al.’s (1) first claim, it is well known that polymeric phase V of CO2 (CO2-V) is metastable at low pressures below 10 GPa, where phase I is a thermodynamically stable phase. As such, in this pressure region CO2-V transforms back to phase I rather rapidly, especially below 3–5 GPa. This point is highlighted in figure 5A of our paper (2), showing a rapid conversion of CO2-V below 10 …

Reply to Datchi et al.: Recovered phase CO 2 -V at low temperature and a newly predicted 3D-extended CO 2 phase

Reply to Datchi et al.: Recovered phase CO ₂ -V at low temperature and a newly predicted 3D-extended CO ₂ phase