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Ground-state characterizations of systems predicted to exhibit L1_1 or L1_3 crystal structures

机译:预计将表现出L1_1或L1_3晶体结构的系统的基态表征

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摘要

Despite their geometric simplicity, the crystal structures L1_1 (CuPt) and L1_3 (CdPt_3) do not appear as ground states experimentally, except in Cu-Pt. We investigate the possibility that these phases are ground states in other binary intermetallic systems, but overlooked experimentally. Via the synergy between high-throughput and cluster-expansion computational methods, we conduct a thorough search for systems that may exhibit these phases and calculate order-disorder transition temperatures when they are predicted. High-throughput calculations predict L1_1 ground states in the systems Ag-Pd, Ag-Pt, Cu-Pt, Pd-Pt, Li-Pd, Li-Pt, and L1_3 ground states in the systems Cd-Pt, Cu-Pt, Pd-Pt, Li-Pd, Li-Pt. Cluster expansions confirm the appearance of these ground states in some cases. In the other cases, cluster expansion predicts unsuspected derivative superstructures as ground states. The order-disorder transition temperatures for all L1_1/L1_3 ground states were found to be sufficiently high that their physical manifestation may be possible.
机译:尽管它们的几何简单性,但晶体结构L1_1(CuPt)和L1_3(CdPt_3)在实验中并未显示为基态,除了在Cu-Pt中。我们调查了这些相在其他二元金属互化物系统中为基态的可能性,但在实验中被忽略了。通过高通量和聚类扩展计算方法之间的协同作用,我们对可能表现出这些相的系统进行了全面搜索,并在预测时计算了有序-无序转变温度。高通量计算可预测系统Cd-Pt,Cu-Pt,Ag-Pd,Ag-Pt,Cu-Pt,Pd-Pt,Li-Pd,Li-Pt和L1_3基态中的L1_1基态Pd-Pt,Li-Pd,Li-Pt在某些情况下,团簇扩展证实了这些基态的出现。在其他情况下,团簇扩展将意外的派生上层建筑预测为基态。发现所有L1_1 / L1_3基态的有序无序转变温度都很高,以至于它们的物理表现是可能的。

著录项

  • 来源
    《Physical review》 |2012年第5期|p.054203.1-054203.9|共9页
  • 作者单位

    Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA;

    Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA;

    Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alloys; phase diagrams of metals and alloys;

    机译:合金;金属和合金的相图;

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