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Completeness of the exact muffin-tin orbitals: Application to hydrogenated alloys

机译:精确的松饼-锡轨道的完整性:在氢化合金中的应用

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摘要

We investigate the basis set convergence of the exact muffin-tin orbitals by monitoring the equation of state for Al, Cu, and Rh calculated in the conventional face-centered-cubic lattice (str-I) and in a face-centered-cubic lattice with one atomic and three empty sites per primitive cell (str-II). We demonstrate that three (spd) muffin-tin orbitals are sufficient to describe Al in both structures, but for str-II Cu and Rh at least five (spdfg) orbitals are needed to get converged equilibrium Wigner-Seitz radius (within ≤0.8%) and bulk modulus (≤3.3%). We ascribe this slow convergence to the nearly spherical densities localized around the Cu and Rh atoms, which create strongly asymmetric charge distributions within the nearest cells around the empty sites. The potential sphere radius dependence of the theoretical results for structure str-II is discussed. It is shown that a properly optimized overlapping muffin-tin potential in combination with the spdfg basis yields acceptable errors in the equilibrium bulk properties. The basis set convergence is also shown on hydrogenated Sc and Sc-based alloys.
机译:我们通过监视在常规面心立方晶格(str-I)和面心立方晶格中计算的Al,Cu和Rh的状态方程,研究精确的松饼锡轨道的基集收敛。每个原始单元(str-II)具有一个原子和三个空位。我们证明了三个(spd)松饼-锡轨道足以描述两种结构中的Al,但是对于str-II Cu和Rh,至少需要五个(spdfg)轨道才能达到收敛的平衡Wigner-Seitz半径(≤0.8%) )和体积模量(≤3.3%)。我们将这种缓慢的收敛归因于位于Cu和Rh原子周围的接近球形的密度,这在空位周围的最近单元中产生了强烈的不对称电荷分布。讨论了结构str-II的理论结果与势球半径的关系。结果表明,适当优化的重叠松饼锡电位与spdfg基础相结合,可以在平衡体积特性方面产生可接受的误差。基集收敛也显示在氢化Sc和Sc基合金上。

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  • 来源
    《Physical review》 |2010年第4期|045122.1-045122.10|共10页
  • 作者单位

    Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology,SE-100 44 Stockholm, Sweden Department of Applied Material Physics, Tafila Technical University, Tafila, Jordan;

    Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology,SE-100 44 Stockholm, Sweden;

    rnApplied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology,SE-100 44 Stockholm, Sweden Division for Materials Theory, Department of Physics and Materials Science, Uppsala University, SE-75121 Uppsala, Sweden;

    rnApplied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology,SE-100 44 Stockholm, Sweden Division for Materials Theory, Department of Physics and Materials Science, Uppsala University, SE-75121 Uppsala, Sweden Research Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary;

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  • 正文语种 eng
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  • 关键词

    basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.); total energy and cohesive energy calculations; crystal binding; cohesive energy;

    机译:基集(LCAO;平面波;APW等)和相关方法(散射方法;ASA;线性化方法等);总能量和内聚能计算;晶体结合内聚能;

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