Electronic structures and impurity cluster features in Mg-Zn-Y alloys with a synchronized long-period stacking ordered phase

Electronic structures and impurity cluster features in Mg-Zn-Y alloys with a synchronized long-period stacking ordered phase
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同步长周期堆垛有序相Mg-Zn-Y合金的电子结构和杂质团簇特征

DOI:
10.1016/j.jallcom.2018.05.163
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发表时间:
2018
影响因子:
6.2
通讯作者:
and H. Sato
and H. Sato
中科院分区:
材料科学2区
文献类型:
--
作者:
S. Hosokawa;K. Maruyama;K. Kobayashi;J. R. Stellhorn;B. Paulus;A. Koura;F. Shimojo;T. Tsumuraya;M. Yamasaki;Y. Kawamura;S. Yoshioka;and H. Sato

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对具有同步长周期堆叠有序相和未掺杂 Mg 的多晶 Mg97Zn1Y2、Mg85Zn6Y9 和 Mg75Zn10Y15 合金进行光电发射和反光电发射光谱(PES 和 IPES)测量,分别研究价带和导带电子结构。从价带PES光谱发现,未掺杂的Mg包含至多25%的本征氧化部分。随着杂质浓度的增加,价带态密度 (DOS) 的变化非常轻微,而导带 DOS 的变化却很大。使用 Mg85Zn6Y9 合金的密度泛函理论计算阐明了杂质元素的贡献。还在 Mg 2s、2p、Zn 3p、3d 和 Y 3d 水平上进行了岩心水平 PES 测量,以研究相应元素的化学性质。 Y 3dcore 谱在 Mg97Zn1Y2 中主要呈现出三个双峰,而在重掺杂合金中大多只有一个双峰,反映了 Y 原子的三个不同位点的共存; Zn6Y8L12团簇中的、碎片中的以及Mg97Zn1Y2中孤立的。
Photoemission and inverse-photoemission spectroscopy (PES and IPES) measurements were carried out on polycrystalline Mg97Zn1Y2, Mg85Zn6Y9, and Mg75Zn10Y15alloys with a synchronized long-period stacking ordered phase together with non-doped Mg to investigate the valence- and conduction-band electronic structures, respectively. It was found from the valence-band PES spectra that the non-doped Mg includes at most 25% of an intrinsic oxidation portion. With increasing impurity concentration, the valence-band density of states (DOS) very slightly changes, while the conduction-band DOS drastically varies. The contributions of the impurity elements are clarified using a density functional theory calculation for the Mg85Zn6Y9alloy. The core-level PES measurements were also performed at the Mg 2s, 2p, Zn 3p, 3d, and Y 3dlevels to study the chemical natures of the corresponding elements. The Y 3dcore spectrum exhibits mostly three doublets in Mg97Zn1Y2, while mostly only one in the heavily doped alloys, reflecting a coexistence of three different sites of the Y atoms; ones in the Zn6Y8L12clusters, ones in their fragments, and isolated ones in Mg97Zn1Y2.
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