Electronic structure of bulk metallic glass Zr55Al10Cu30Ni5
Electronic structure of bulk metallic glass Zr55Al10Cu30Ni5
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DOI：
10.1016/j.elspec.2005.01.139
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发表时间：
2005-06
影响因子：
1.9
通讯作者：
K. Soda;K. Shimba;S. Yagi;Masahiko Kato;T. Takeuchi;U. Mizutani;T. Zhang;M. Hasegawa;A. Inoue-A.
中科院分区：
文献类型：
--
作者：
K. Soda;K. Shimba;S. Yagi;Masahiko Kato;T. Takeuchi;U. Mizutani;T. Zhang;M. Hasegawa;A. Inoue-A.
全文：本文用光电子能谱方法研究了Z{sub 55}Al{sub 10}Cu{sub 30}Ni{sub 5}大块金属玻璃的电子结构，从微观角度探讨了其大的玻璃形成能力和独特的力学性能的来源。在分子科学研究所的750 MeV电子储存环UVSOR的BL 5 U上用高分辨率分析仪在低温下记录光电子谱。从通过铸造方法制备的金属玻璃的锭中切割试样，并且通过用金刚石锉原位刮擦试样来获得用于光电子测量的它们的清洁表面。价带光电子能谱显示了Zr 4d、Ni 3d和Cu 3d态的三个带。这些带的显著特征是具有高结合能和窄宽度的高度对称的光谱形状，与晶态过渡金属的d带相比。这是由于金属玻璃中与过渡金属杂化的相邻原子减少以及缺乏结晶周期性。高分辨率测量还发现费米能级附近的强度降低，这意味着电子结构中的赝能隙可能是玻璃形成的重要因素之一。
Full text: The electronic structure of a bulk metallic glass Z{sub 55}Al{sub 10}Cu{sub 30}Ni{sub 5} has been studied by means of photoelectron spectroscopy in order to understand the origins of its large glass formation ability and unique mechanical properties from the microscopic point of view. Photoelectron spectra were recorded at low temperatures with a high-resolution analyzer at BL5U of UVSOR, a 750 MeV electron storage ring at Institute for Molecular Science. Specimens were cut from an ingot of the metallic glass prepared by a casting method and their clean surfaces for the photoelectron measurement were obtained by in situ scraping the specimen with a diamond file. The valence-band photoelectron spectra show three bands ascribed to the Zr 4d, Ni 3d and Cu 3d states. Remarkable feature of these bands is the highly-symmetric spectral shape with the high binding energy and narrow width in comparison with the d bands of the crystalline transition metals. This is attributed to the reduction in the neighboring atoms to hybridize with those transition metals and the lack of the crystalline periodicity in the metallic glass. High-resolution measurement also reveals the intensity reduction near the Fermi level, which implies the pseudo-gap in the electronic structure may be one of the important factors for the glass formation.