In situ atomic-scale oscillation sublimation of magnesium under CO₂ conditions.

Sun, Yong; Guo, Jianxin; Fernandez, Carlos; Huang, Jianyu; Peng, Qiuming

Abstract

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.

Citation

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

• Journal Article Type: Article
• Acceptance Date: Dec 8, 2018
• Online Publication Date: Dec 10, 2018
• Publication Date: Jan 31, 2019
• Deposit Date: Jan 21, 2019
• Publicly Available Date: Dec 11, 2019
• Journal: Langmuir
• Print ISSN: 0743-7463
• Electronic ISSN: 1520-5827
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 35
• Issue: 1
• Pages: 300-305
• DOI: https://doi.org/10.1021/acs.langmuir.8b03580
• Keywords: Magnesium; Carbon dioxide; Sublimation; Gas-state; Amorphos
• Public URL: http://hdl.handle.net/10059/3265
• Contract Date: Jan 21, 2019