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Article Dans Une Revue Dalton Transactions Année : 2021

A straightforward approach to high purity sodium silicide Na4Si4

Résumé

Sodium silicide Na4Si4 is a reductive and reactive source of silicon highly relevant to designing non-oxidic silicon materials, including clathrates, various silicon allotropes, and metal silicides. Despite the impor-tance of this compound, its production in high amounts and high purity is still a bottleneck with reported methods. In this work, we demonstrate that readily available silicon nanoparticles react with sodium hydride with a stoichiometry close to the theoretical one and at a temperature of 395 °C for shorter duration than previously reported. This enhanced reactivity of silicon nanoparticles makes the procedure robust and less dependent on experimental parameters, such as gas flow. As a result, we deliver a pro-cedure to achieve Na4Si4 with purity of ca. 98 mol% at the gram scale. We show that this compound is an efficient precursor to deliver selectively type I and type II sodium silicon clathrates depending on the con-ditions of thermal decomposition
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Dates et versions

hal-03537395 , version 1 (20-01-2022)

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Yang Song, Isabel Gómez-Recio, Ram Kumar, Cristina Coelho Diogo, Sandra Casale, et al.. A straightforward approach to high purity sodium silicide Na4Si4. Dalton Transactions, 2021, 50 (45), pp.16703-16710. ⟨10.1039/D1DT03203H⟩. ⟨hal-03537395⟩
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