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Updated: May 27, 2026

Fabrication and Optimization of Type II Silicon Clathrate Films

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

Structural identification of caged vanadium doped silicon clusters.

P Claes¹, E Janssens, V T Ngan

¹Laboratory of Solid State Physics and Magnetism, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium.

Physical Review Letters

|November 24, 2011

Summary

Investigating cationic silicon clusters with vanadium, researchers found they form endohedral cages. The silicon-16 vanadium cluster exhibits a dynamic, symmetric Frank-Kasper structure.

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Area of Science:

Physical Chemistry
Materials Science
Computational Chemistry

Background:

Cationic silicon clusters are fundamental building blocks in materials science.
Understanding the structure and properties of doped clusters is crucial for developing new materials.
Vanadium doping introduces unique electronic and structural characteristics.

Purpose of the Study:

To determine the geometric structures of cationic silicon clusters doped with vanadium (Si(n)V+, n=12-16).
To elucidate the nature of the bonding and cage formation in these doped clusters.
To investigate the dynamic behavior of larger doped silicon-vanadium clusters.

Main Methods:

Infrared multiple photon dissociation (IRMPD) spectroscopy of rare gas complexes (e.g., Ar) of Si(n)V+.
Ab initio electronic structure calculations (e.g., DFT) to model cluster geometries and energies.
Comparison of experimental IRMPD spectra with calculated vibrational frequencies.

Main Results:

The cationic silicon-vanadium clusters (Si(n)V+, n=12-16) adopt endohedral cage structures.
Evidence suggests that the Si(16)V+ cluster exists as a fluxional system.
The fluxional Si(16)V+ cluster displays a symmetric Frank-Kasper geometry.

Conclusions:

Vanadium doping leads to the formation of stable endohedral cage structures in silicon clusters.
The Si(16)V+ cluster represents a novel example of a fluxional system with a highly symmetric geometry.
These findings provide insights into the structure-property relationships of doped silicon clusters for potential applications.