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Updated: Mar 19, 2026

Fabrication and Optimization of Type II Silicon Clathrate Films

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

Silicon Framework-Based Lithium Silicides at High Pressures.

Shoutao Zhang¹, Yanchao Wang¹, Guochun Yang^1,2

¹State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.

ACS Applied Materials & Interfaces

|June 16, 2016

Summary

This summary is machine-generated.

Researchers discovered new lithium silicide structures stable at high pressures. These novel silicon allotropes exhibit unique bonding and could advance materials for electronics and energy applications.

Keywords:

electronic property high pressure lithium silicide silicon allotrope structural prediction

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Area of Science:

Materials Science
Solid State Physics
Computational Chemistry

Background:

Diamond silicon's bandgap limits applications like photovoltaics and LEDs.
New silicon allotropes are sought for improved electronic and optical properties.
Previous research synthesized NaSi6, yielding a silicon allotrope with a 1.3 eV bandgap.

Purpose of the Study:

Investigate Li-Si compounds at high pressures.
Discover new stable Li-Si phases.
Explore structural and electronic properties of novel silicon allotropes.

Main Methods:

Swarm intelligence-based structural prediction.
First-principles calculations.
High-pressure synthesis and characterization.

Main Results:

Seven new stable Li-Si compositions identified above 8.4 GPa.
Si-Si bonding evolves from frameworks to chains and isolated ions with increasing Li content.
Cmmm-structured LiSi4 exhibits 1D Li chains within covalent Si channels, stable at ambient pressure.

Conclusions:

Li-Si binary compounds offer promising new silicon allotropes.
Si-Si interactions are key to structural stability.
These findings advance understanding of high-pressure materials and Li-Si systems.