Formation enthalpy of intermetallic phases from Al-Fe system measured with solution calorimetric method

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• 作者：W. Gą ; sior ; A. Dę ; bski ; ^{nmdebski@imim-pan.krakow.pl} ; Z. Moser
• 关键词：A. Aluminides ; miscellaneous ; B. Phase diagrams ; B. Phase identification ; B. Thermodynamic and thermochemical properties ; F. Calorimetry
• 刊名：Intermetallics
• 出版年：2012
• 期刊代码：36_09669795
• 类别：ms
• 出版时间：May, 2012
• 卷：24
• 期：Complete
• 页码：99-105
• 文件大小：789 K

摘要

The solution calorimetric method was used for the determination of the formation enthalpy of Al₂Fe and Al₅Fe₂ intermetallic phases. The phases were prepared in a very pure Ar atmosphere by melting the calculated amounts of Al and Fe in alumina crucibles. Their crystal structure was confirmed with the X-ray diffraction method. A very low amount of Al₅Fe₂ phase was found in the Al₂Fe phase. The calorimetric experiments were carried out using an Al bath at temperature 1271聽K. The formation enthalpies of the Al₅Fe₂ and Al₂Fe phases obtained at room temperature were聽鈭?0.5 and聽鈭?7.8聽kJ/mol of atoms, respectively.