DFT insights into the electronic structure, mechanical behaviour, lattice dynamics and defect processes in the first...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• MAX phases are a family of ternary carbides and nitrides with unique properties.
• Scandium-based M₂SnC phases are less explored compared to other M₂SnC compounds.
• Understanding material properties is crucial for developing new applications.

Purpose of the Study:

• Investigate the physical properties of the novel Sc-based MAX phase, Sc₂SnC.
• Compare Sc₂SnC with existing M₂SnC phases.
• Assess the potential of Sc₂SnC for applications like 2D MXenes and thermal barrier coatings.

Main Methods:

• Density Functional Theory (DFT) calculations.
• Investigation of structural, mechanical, and dynamic stability.
• Analysis of electronic structure and bonding characteristics.

Main Results:

• Sc₂SnC is structurally, mechanically, and dynamically stable.
• The material is metallic with mixed covalent and ionic bonding, influenced by effective valence.
• Sc₂SnC exhibits significant deformability and softness, ranking second in its family.
• Elastic anisotropy is moderate, and hardness/melting point correlate with bulk modulus.

Conclusions:

• Sc₂SnC is a stable and promising new MAX phase.
• The material's properties suggest potential for synthesis into 2D MXenes.
• Sc₂SnC shows promise as a thermal barrier coating material.