A thermodynamic description of the Cr-Ge system
A thermodynamic description of the Cr-Ge system
复制标题
Cr-Ge 体系的热力学描述
DOI：
10.1016/j.jallcom.2009.03.113
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发表时间：
2009-07-29
影响因子：
6.2
通讯作者：
Du, Zhenmin
中科院分区：
文献类型：
--
作者：
Li, Mei;Guo, Cuiping;Du, Zhenmin
利用相图计算技术对Cr-Ge系的相平衡和热力学性质进行了优化。在目前的工作中，过量吉布斯自由能的液体，体心立方（bcc）和金刚石溶液相的Redlich-Kister方程建模。采用多项式温度依赖关系和Kaptay方程描述了溶液相（液相、体心立方相、金刚石相）的过量吉布斯自由能。分别用亚晶格模型Cr-3（Cr，Ge）、α（Cr，Ge）（5）Ge-3和β（Cr，Ge）（5）Ge-3处理具有均匀性范围的金属间化合物Cr 3Ge、α Cr 5Ge 3和β Cr 5Ge 3。金属间化合物Cr 11 Ge 8、CrGe和Cr 11 Ge 19被处理为化学计量化合物。得到了两组自洽的热力学参数，给出了计算结果，并与实验数据进行了比较。(C)2009爱思唯尔有限公司版权所有。
The phase equilibria and thermodynamic properties of the Cr-Ge system were optimized using the CALPHAD (Calculation of Phase Diagram) technique. In the present work, the excess Gibbs energy of the liquid, body-centered cubic (bcc) and diamond solution phases were modeled with the Redlich-Kister equation. The excess Gibbs energies for the solution phases (liquid, bcc, diamond) were described using the polynomial temperature dependence and Kaptay equation. The intermetallic compounds Cr3Ge, alpha Cr5Ge3 and beta Cr5Ge3, which had homogeneity ranges, were treated with sublattice models Cr-3(Cr, Ge), alpha(Cr, Ge)(5)Ge-3 and beta(Cr, Ge)(5)Ge-3, respectively. The intermetallic compounds Cr11Ge8, CrGe and Cr11Ge19 were treated as stoichiometric compounds. Two sets of self-consistent thermodynamic parameters were obtained and the calculated results were presented and compared with the experimental data. (C) 2009 Elsevier B.V. All rights reserved.