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• W2976244977 abstract "Quaternary $mathrm{CaO}text{ensuremath{-}}mathrm{MgO}text{ensuremath{-}}{mathrm{Al}}_{2}{mathrm{O}}_{3}text{ensuremath{-}}{mathrm{SiO}}_{2}$ (CMAS) glasses are important constituents of the Earth's lower crust and mantle, and they also have important industrial applications such as in metallurgical processes, concrete production, and emerging low-${mathrm{CO}}_{2}$ cement technologies. In particular, these applications rely heavily on the composition-structure-reactivity relationships for CMAS glasses, which are not yet well established. In this study, we combined force-field molecular dynamics (MD) simulations and density functional theory (DFT) calculations to generate detailed structural representations for a CMAS glass. The generated structures are not only thermodynamically favorable (according to DFT calculations) but also agree with experiments (including our x-ray and neutron total scattering data as well as literature data). Detailed analysis of the final structure (including partial pair distribution functions, coordination number, and oxygen environment) enabled existing discrepancies in the literature to be reconciled and has revealed important structural information on the CMAS glass, specifically (i) the unambiguous assignment of medium-range atomic ordering, (ii) the preferential role of Ca atoms as charge compensators and Mg atoms as network modifiers, (iii) the proximity of Mg atoms to free oxygen sites, and (iv) clustering of Mg atoms. Electronic property calculations suggest higher reactivity for Ca atoms as compared with Mg atoms, and that the reactivity of oxygen atoms varies considerably depending on their local bonding environment. Overall, this information may enhance our mechanistic understanding on CMAS glass dissolution behavior in the future, including dissolution-related mechanisms occurring during the formation of low-${mathrm{CO}}_{2}$ cements." @default.
• W2976244977 created "2019-10-03" @default.
• W2976244977 creator A5008282591 @default.
• W2976244977 creator A5041830746 @default.
• W2976244977 creator A5059240870 @default.
• W2976244977 creator A5061620513 @default.
• W2976244977 date "2021-01-11" @default.
• W2976244977 modified "2023-10-15" @default.
• W2976244977 title "Density functional modeling and total scattering analysis of the atomic structure of a quaternary<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>CaO</mml:mi><mml:mtext>−</mml:mtext><mml:mi>MgO</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>Al</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mtext>−</mml:mtext><mml:msub><mml:mi>SiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>(CMAS…" @default.
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