What Can DP Do too? | Machine Learning Interatomic Potential for Mg-Al-Si-O System Boosts Deep Earth Material Research
Phase diagrams and thermodynamic properties of deep Earth materials are fundamental to geophysics, geodynamics and geological research. As the core chemical system of mantle mineralogy, the Mg-Al-Si-O system governs the stability and physical properties of dominant mantle minerals and melts, further modulating mantle dynamics and plate tectonics. Recently, Xin Zhong, Timm John from Free University of Berlin and Yifan Li from Princeton University published their research A general purposed machine learning interatomic potential for Mg-Al-Si-O system suitable for Earth materials at high pressure and temperature conditions in npj Computational Materials. The team developed a universal machine learning interatomic potential for the Mg-Al-Si-O system. By combining the r2SCAN functional with pairwise Gaussian energy correction, the average enthalpy error of over 20 mineral phases was reduced from 5.2 kJ/mol to 1.2 kJ/mol. The potential reproduces phase diagrams of systems including SiO2 Al2SiO5 and Mg2SiO4 with excellent consistency against experimental measurements. The study quantitatively characterizes the anisotropy of solid–melt interfacial free energy for periclase and forsterite at the atomic scale, and quantifies how non-hydrostatic stress modulates the α-β quartz phase transition.