A thermodynamic modeling of the Gd-Tl system

作者：Guo Cuiping; Li Changrong; Du Zhenmin^*

来源：Journal of Alloys and Compounds, 2010, 492(1-2): 122-127.

DOI：10.1016/j.jallcom.2009.11.101

• Gd-Tl phase diagram
• Thermodynamic properties
• CALPHAD technique

The phase equilibria and thermodynamic properties of the Gd-Tl system were optimized using the CALPHAD (CALculation of PHAse Diagram) technique. In the present work, the excess Gibbs energies of the liquid, bcc and hcp solution phases were modeled using the polynomial temperature dependence and Kaptay equation. The intermetallic compounds Gd(2)Tl, Gd(3)Tl(5) and GdTl(3) were treated as stoichiometric compounds. The intermetallic compound Gd(5)Tl(3), which had a homogeneity range, was treated with a sub-lattice model (Gd,Tl)(5)Tl(3). A sublattice model (Gd,Tl)(0.5)(Gd,Tl)(0.5) was applied to describe the compound GdTl in order to cope with the order-disorder transition between GdTI with CsCl-type structure (B2) and body-centered cubic solution (A2) in the Gd-Tl system. Two sets of self-consistent thermodynamic parameters were obtained.

• 出版日期2010-3-4
• 单位北京科技大学