In situ atomic-scale oscillation sublimation of magnesium under CO₂ conditions.
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SUN, Y., GUO, J., FERNANDEZ, C., HUANG, J. and PENG, Q. 2019. In situ atomic-scale oscillation sublimation of magnesium under CO₂ conditions. Langmuir [online], 35(1), pages 300-305. Available from: https://doi.org/10.1021/acs.langmuir.8b03580
Understanding the interactive role between Mg and CO₂ is crucial for many technological applications, including CO₂ storage, melting protection, corrosion resistance, and ceramic welding. Here we report observations of rapid oscillation sublimation of Mg at room temperature in the presence of both CO₂ gas and electron irradiation using environmental transmission electron microscopy. The sublimation is mainly related to phase transformation of amorphous MgCO₃. Differing from the direct formation of gas-state MgCO₃, which attributes to the sublimation of pure Mg under a mild electron beam dose, a unique oscillation process is detected during the process of Mg sublimation under a harsh electron beam dose. The main reason stems from the first-order reaction of a reversible decomposition-formation of amorphous MgCO₃. These atomic-level results provide some interesting insights into the interactive role between Mg and CO₂ under electron beam irradiation.