Enthalpy of formation of intermetallic compounds from the Li-Si system

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• 作者：A. D臋bski ; ^{nmdebski@imim-pan.krakow.pl} ; W. G膮sior ; A. Gó ; ral
• 关键词：B. Phase diagrams ; B. Thermodynamic and thermochemical properties ; B. Hydrogen storage ; B. Phase identification ; F. Calorimetry
• 刊名：Intermetallics
• 出版年：2012
• 期刊代码：36_09669795
• 类别：ms
• 出版时间：July, 2012
• 卷：26
• 期：Complete
• 页码：157-161
• 文件大小：490 K

摘要

With the use of the solution calorimetric method, the energetic effect of solutions of Li and the Li₁₃Si₄, Li₇Si₃ and Li₁₂Si₇ intermetallic compounds in the acetic acid were measured and next the formation enthalpies of the compounds were calculated. The intermetallic compounds were prepared by means of melting lithium and silicon in a glove-box under the protective atmosphere of high purity argon. The obtained compounds were X-ray analyzed in order to confirm theirs structure. The TEM analysis of the precipitate obtained after the dissolution of the phases in the acetic acid showed that it was pure silicon. The measured heat of the reaction of Li in the acetic acid equals聽鈭?61.1聽卤聽1.6聽kJ/mol and this value was applied in the calculations. The values obtained for the formation enthalpy of the compounds are as follows:聽鈭?0.4聽卤聽0.8 for Li₁₃Si₄,聽鈭?9.4聽卤聽1.0 for Li₇Si₃ and聽鈭?5.6聽卤聽1.9 for Li₁₂Si₇.