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Related Experiment Video

Updated: Jul 15, 2026

The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique

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Synthesis, structure, and properties of BaAl2Si2.

Cathie L Condron¹, Håkon Hope, Paula M B Piccoli

¹Department of Chemistry, One Shields Avenue, University of California, Davis, California 95616, USA.

Inorganic Chemistry

|May 2, 2007

Summary

Barium aluminum silicide (BaAl2Si2) forms a stable 3D framework structure, unlike its germanium analog, and exhibits metallic properties. This discovery advances understanding of complex inorganic materials.

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Area of Science:

Solid State Chemistry
Materials Science
Crystallography

Background:

Barium aluminum silicide (BaAl2Si2) is an inorganic compound with potential applications in materials science.
Understanding its crystal structure and properties is crucial for further research and development.

Purpose of the Study:

To synthesize and characterize single crystals of BaAl2Si2.
To determine its crystal structure and investigate its phase transition behavior.
To explore its electronic and magnetic properties.

Main Methods:

Single crystal growth from an aluminum molten flux.
Single-crystal X-ray diffraction at low temperatures (10 and 90 K).
Single-crystal neutron diffraction at room temperature.

Main Results:

BaAl2Si2 crystallizes in the alpha-BaCu2S2 structure type (space group Pnma).
It forms an open 3D framework with aluminum and silicon in a covalent network, encapsulating Ba2+ cations.
Unit cell dimensions were determined: a=10.070(3) Å, b=4.234(1) Å, c=10.866(3) Å.
No alpha to beta phase transition was observed, unlike in BaAl2Ge2.
The compound exhibits metallic electronic resistivity and Pauli paramagnetic behavior.

Conclusions:

BaAl2Si2 is a stable compound with a unique 3D framework structure.
Its structural and electronic properties differ from the germanium analog, BaAl2Ge2.
The findings provide fundamental insights into the Ba-Al-Si system and related materials.