Single crystal growth of type I Na–Si clathrate by using Na–Sn flux

Highlights

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Single crystals of type I Na–Si clathrate, Na₈Si₄₆, were synthesized by using Na–Sn flux.

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Preparation conditions of the single crystals were cleared.

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The details of the crystal growth process were investigated.

Abstract

Single crystals of type I Na–Si clathrate, Na₈Si₄₆, were synthesized by heating Na, Na₄Si₄, and Na₁₅Sn₄ at 723 K under an Ar gas pressure of 10⁴ Pa for 12 h. The single crystals having {110} habit planes grew up to 1.5 mm in size due to Na evaporation from a Na–Si–Sn melt with a starting compositional molar ratio of Na/Si/Sn=5.75:2:1.

Keywords

• A2. Single crystal growth; 
• A2. Growth from solutions; 
• A2. Tin flux growth; 
• B1. Inorganic compounds; 
• B1. Silicon compounds; 
• B1. Clathrate compound
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    • • • Soure:sciencedirect