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ATAT@WIEN2k: An interface for cluster expansion based on the linearized augmented planewave method

机译:ATAT @ WIEN2k:基于线性化增强平面波方法的集群扩展接口

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摘要

We have developed an interface between the all-electron density functional theory code WIEN2k, and the MIT Ab-initio Phase Stability (MAPS) code of the Alloy-Theoretic Automated Toolkit (ATAT). WIEN2k is an implementation of the full-potential linearized augmented planewave method which yields highly accurate total energies and optimized geometries for any given structure. The ATAT package consists of two parts. The first one is the MAPS code, which constructs a cluster expansion (CE) in conjunction with a first-principles code. These results form the basis for the second part, which computes the thermodynamic properties of the alloy. The main task of the CE is to calculate the many-body potentials or effective cluster interactions (ECIs) from the first-principles total energies of different structures or supercells using the structure-inversion technique. By linking MAPS seamlessly with WIEN2k we have created a tool to obtain the ECIs for any lattice type of an alloy. We have chosen fcc Al-Ti and bcc W-Re to evaluate our implementation. Our calculated ECIs exhibit all features of a converged CE and compare well with literature results.
机译:我们已经开发了全电子密度泛函理论代码WIEN2k与合金理论自动工具包(ATAT)的MIT Ab-initio相稳定性(MAPS)代码之间的接口。 WIEN2k是全电势线性化增强平面波方法的实现,该方法可为任何给定结构产生高度精确的总能量和优化的几何形状。 ATAT软件包包括两个部分。第一个是MAPS代码,它与第一原理代码一起构造一个集群扩展(CE)。这些结果构成了第二部分的基础,第二部分计算了合金的热力学性质。 CE的主要任务是使用结构反转技术,根据不同结构或超级电池的第一性原理的总能量来计算多体势或有效簇相互作用(ECI)。通过将MAPS与WIEN2k无缝链接,我们创建了一种工具,可以获取合金的任何晶格类型的ECI。我们选择了fcc Al-Ti和bcc W-Re来评估我们的实施情况。我们计算出的ECI展现了融合CE的所有特征,并与文献结果进行了很好的比较。

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