To clarify the relationship between the glass-forming ability (GFA) and local atomic structure of Pd-based metallic glasses, the structures of an amorphous Pd₄₀Cu₄₀P₂₀ (PCP) were investigated using the same methods as for Pd₄₀Ni₄₀P₂₀ (PNP) metallic glass, i.e., by a combination of anomalous X-ray scattering, X-ray and neutron diffraction, and reverse Monte Carlo modeling. From the comparison between the results of PNP with an excellent GFA and the PCP with a worse GFA, important features characteristic to the GFA are found in the hyper-ordered structures. Firstly, the compositional inhomogeneity of Cu in PCP is larger than Ni in PNP. Secondly, a Voronoi tessellation reveals that icosahedral arrangements are found with considerable probability around the Ni atoms in PNP, while a less existence around the Cu atoms in PCP. Thirdly, a persistent homology (PH) analysis shows smaller intermediate-size Cu PH rings in PCP than Ni PH rings in PNP.

为了阐明玻璃形成能力（GFA）与Pd基金属玻璃的局部原子结构之间的关系，采用与Pd ₄₀ Ni ₄₀相同的方法研究了非晶Pd ₄₀ Cu ₄₀ P ₂₀（PCP）的结构。P ₂₀（PNP）金属玻璃，即通过异常X射线散射，X射线和中子衍射以及反向蒙特卡洛建模的组合。通过比较具有优良GFA的PNP和具有较差GFA的PCP的结果，可以发现超序结构中GFA的重要特征。首先，PCP中Cu的组成不均匀性大于PNP中Ni的组成不均匀性。其次，Voronoi细分表明，在PNP中的Ni原子周围发现了二十面体排列的可能性很高，而在PCP中的Cu原子周围存在的可能性较小。第三，持久同源性（PH）分析显示PCP中的中等尺寸Cu PH环比PNP中的Ni PH环小。