Ab initio approaches to high-entropy alloys: a comparison of CPA, SQS, and supercell methods

Document Type

Article

Publication Date

6-1-2022

Abstract

We present a comparative study of different modeling approaches to the electronic properties of the Hf 0.05Nb 0.05Ta 0.8Ti 0.05Zr 0.05 high-entropy alloy. Common to our modeling is the methodology to compute the one-particle Green’s function in the framework of density functional theory. We demonstrate that the special quasi-random structures modeling and the supercell, i.e., the locally self-consistent multiple-scattering methods, provide very similar results for the ground state properties such as the spectral function (density of states) and the equilibrium lattice parameter. To reconcile the multiple-scattering single-site coherent potential approximation with the real space supercell methods, we included the effect of screening of the net charges of the alloy components. Based on the analysis of the total energy and spectral functions computed within the density functional theory, we found no signature for the long-range or local magnetic moments formation in the Hf 0.05Nb 0.05Ta 0.8Ti 0.05Zr 0.05 high-entropy alloy; instead, we find possible superconductivity below ∼ 9 K.

Publication Source (Journal or Book title)

Journal of Materials Science

First Page

10677

Last Page

10690

This document is currently not available here.

Share

COinS