Ab initiobased interionic interactions in calcium aluminotitanate oxide melts: structure and diffusion

Area of Science:

• Materials Science
• Earth Science
• Geochemistry
• Computational Materials Science

Background:

• Calcium aluminotitanate (CaO-Al2O3-TiO2) ternary oxides are crucial in materials science and geochemistry.
• Atomic-scale properties and interionic interactions of these melts are not well understood.

Purpose of the Study:

• To develop a transferable, unified interionic potential for CaO-Al2O3-TiO2 melts.
• To accurately describe the structural and diffusion properties of these ternary oxide systems.

Main Methods:

• A bottom-up approach was used, fitting single oxide compounds first.
• Unified oxygen charge and O-O interaction terms were employed.
• Ab initio calculations and mean-square difference minimization of partial pair-correlation functions were performed.

Main Results:

• The developed potentials successfully describe structural and diffusion properties of single oxides and ternary melts.
• A unified approach was achieved without further fitting for ternary oxides.
• A mechanism involving Ti-induced triply bonded oxygen explains diffusion evolution.

Conclusions:

• The new interionic potential approach is transferable and effective for CaO-Al2O3-TiO2 melts.
• This method enhances the understanding of atomic-scale behavior in complex oxide systems.
• The findings have implications for industrial applications and geochemical modeling.