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Updated: Dec 11, 2025
06:53
Fabrication and Optimization of Type II Silicon Clathrate Films
Published on: October 14, 2025
792
Structure variations within RSi2 and R2TSi3 silicides. Part I. Structure overview
M Nentwich1, M Zschornak1, M Sonntag1
1Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany.
Summary
This study summarizes structural data for RSi2 and R2TSi3 compounds, identifies missing R2TSi3 candidates using density functional theory, and proposes a new tetragonal structure.
Area of Science:
- Solid State Chemistry
- Materials Science
- Crystallography
Background:
- RSi2 and R2TSi3 compounds exhibit diverse crystal structures.
- Understanding structure-property relationships is crucial for materials design.
Purpose of the Study:
- To compile and analyze structural parameters of RSi2 and R2TSi3 compounds.
- To investigate missing R2TSi3 compounds and predict new synthetic targets.
- To explore structure type relationships and correlations.
Main Methods:
- Compilation and tabulation of crystallographic data (composition, lattice parameters, structure type).
- Application of group-subgroup schemes (Bärnighausen diagrams) to show relationships.
- Density functional theory (DFT) calculations to predict missing compounds.
Main Results:
- Structural parameters for RSi2 and R2TSi3 compounds are systematically summarized.
- DFT identified promising candidates for previously unreported R2TSi3 compounds.
- A correlation between orthorhombic AlB2-like lattices and R/T valency was found.
- A novel tetragonal structure with ordered Si/T sites is proposed.
Conclusions:
- The study provides a comprehensive structural overview of RSi2 and R2TSi3 compounds.
- DFT is effective in predicting novel materials with potential for synthesis.
- Valency plays a key role in the formation of specific crystal structures.
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