Experimental investigation and thermodynamic modeling of the Gd–Si system

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• 作者：Mianliang Huang ; Deborah L. Schlagel ; Frederick A. Schmidt ; Thomas A. Lograsso
• 关键词：Gd– ; Si phase diagram ; Thermal analysis ; X-ray diffraction ; Scanning electron microscopy ; Thermodynamic modeling
• 刊名：Journal of Alloys and Compounds
• 出版年：2007
• 出版时间：30 August 2007
• 年：2007
• 卷：441
• 期：1-2
• 页码：94-100
• 全文大小：645 K

文摘

The Gd–Si system has been investigated via experiments and thermodynamic modeling. In the experimental part, alloys were prepared by arc melting pure Gd and Si slugs and annealing at high temperature. The annealed alloys were then investigated by thermal analysis, X-ray diffraction and scanning electron microscopy. Except for the compound with AlB₂ structure, the existence of all other compounds was confirmed. In our study, instead of Gd₂Si₃, the compound with AlB₂ structure was found to be Gd₃Si₅. Although most of the reported invariant reaction temperatures are in good agreement with the present data, the convex liquidus in the composition range of 55–65 at. % Si was not found. The available phase equilibrium and thermodynamic data for the Gd–Si system were used in optimization of thermodynamic parameters by WinPhad software. The calculated phase equilibria and thermodynamic properties were compared to the corresponding experimental data and good agreement was found.