Synthesizing Li7Si12: Orthorhombic Silicon Allotrope

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In summary, the conversation discusses the possibility of synthesizing orthorhombic silicon allotrope, specifically Li7Si12, and requests ideas on how to do so. The main idea is presented in a research paper, but it is noted that most of the work on this topic is theoretical. Additionally, the Zintl phase lithium silicide has been synthesized through a straightforward but challenging process.
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GSRush
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Dear All!

I want to synthesize silicon allotrope. Not just cubic silicon, but orthorhombic.
But in the first step, I need to synthesize Li7Si12.
Is it possible or not?
Any ideas about how to do it?

The main idea can be found at this https://www.researchgate.net/publication/336207000_New_candidate_to_reach_Shockley-Queisser_limit_The_DFT_study_of_orthorhombic_silicon_allotrope_SioP32.

Any ideas?
 
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  • #2
Just to be clear: the paper you link to is theoretical, and it looks like most of the work that's been done on orthorhombic silicon is also theoretical. So YMMV.

The Zintl phase lithium silicide apparently does exist in the literature:
https://doi.org/10.1016/j.ssnmr.2011.09.002
The synthesis is straightforward, though not particularly easy: Li and Si heated directly under a reduced pressure inert atmosphere, then annealed.
 

1. What is Li7Si12?

Li7Si12 is a chemical compound composed of lithium and silicon atoms. It is also known as orthorhombic silicon allotrope and has a unique crystal structure.

2. How is Li7Si12 synthesized?

Li7Si12 can be synthesized through a solid-state reaction between lithium and silicon at high temperatures. This process involves heating the elements in a sealed tube under vacuum or in an inert gas atmosphere.

3. What are the properties of Li7Si12?

Li7Si12 has a high melting point of 1,600°C and is a hard, brittle material. It is also a semiconductor with a band gap of approximately 2.5 eV. Additionally, Li7Si12 has a low density and is lightweight.

4. What are the potential applications of Li7Si12?

Li7Si12 has potential applications in energy storage, particularly in the development of high-capacity lithium-ion batteries. It is also being researched as a potential material for thermoelectric devices, as it has a high Seebeck coefficient and low thermal conductivity.

5. What are the challenges in synthesizing Li7Si12?

The main challenge in synthesizing Li7Si12 is achieving a high purity of the compound. Any impurities can significantly affect its properties and potential applications. Additionally, the high temperatures and controlled environment required for synthesis can make the process difficult and expensive.

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