Density functional modeling and total scattering analysis of the atomic structure of a quaternary CaO−MgO−Al2O3−SiO2 (CMAS) glass: Uncovering the local environment of calcium and magnesiumRemoveKai Gong, V. Ongun Özçelik, Kengran Yang, and Claire E. WhitePhys. Rev. Materials 5, 015603 (2021)