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arXiv 1303.3536cond-mat.mtrl-sci
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Cu-Pd-S三元体系温度依赖性Phase Diagram的第一性原理模型

First Principles Modeling of the Temperature Dependent Ternary Phase Diagram for the Cu-Pd-S System

William Paul Huhn, Michael Widom, Michael C. Gao

摘要:

作为氢分离膜开发的辅助手段,我们用第一性原理计算结合热力学原理预测了温度依赖的相图。我们的方法模型的相图没有经验拟合参数。通过应用热力学原理和固溶体模型,可以解释Cu-Pd-S系统的温度依赖性特征,特别是在选择的晶相中的取代的溶解度范围。电子态密度的计算解释了某些化学取代的相对稳定性。此外,我们计算硫化阈值的Pd-S2系统和活动的Cu-Pd二进制的温度制度,相图包含多个固相。

英文摘要:

As an aid to the development of hydrogen separation membranes, we predict the temperature dependent phase diagrams using first principles calculations combined with thermodynamic principles. Our method models the phase diagram without empirical fitting parameters. By applying thermodynamic principles and solid solution models, temperature-dependent features of the Cu-Pd-S system can be explained, specifically solubility ranges for substitutions in select crystalline phases. Electronic densities of states calculations explain the relative favorability of certain chemical substitutions. In addition, we calculate sulfidization thresholds for the Pd-S2 system and activities for the Cu-Pd binary in temperature regimes where the phase diagram contains multiple solid phases.

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