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標題:Electronic structure of Ni-Cu alloys : the d-electron charge distribution
學年86
學期2
出版(發表)日期1998/06/01
作品名稱Electronic structure of Ni-Cu alloys : the d-electron charge distribution
作品名稱(其他語言)
著者Hsieh, H. H.; Chang, Y. K.; Pong, Way-faung; Pieh, J. Y.; Tseng, P. K.; Sham, T. K.; Coulthard, I.; Naftel, S. J.; Lee, J. F.; Chung, S. C.; Tsang, K. L.
單位淡江大學物理學系
出版者College Park: American Physical Society
著錄名稱、卷期、頁數Physical Review B (Condensed Matter) 57(24), pp.15204-15210
摘要This work investigates charge redistribution in a series of Ni-Cu alloys using x-ray photoemission spectroscopy (XPS) and Ni/Cu L3,2- and K-edge x-ray-absorption near-edge structure (XANES). XPS results show that the constituent d bands are well separated and shifted to a slightly higher binding energy upon dilution into the other host, indicating that the atomic sites in the alloy are not as well screened relative to the pure metal. However, no significant d-band narrowing is observed, suggesting that there is modest d-d interaction in the alloys. In contrast to the XPS observation, XANES results show a reduction in white-line intensity at both edges relative to the pure metal suggesting that both Ni and Cu sites gain d charge. The unoccupied Ni d band is far from fully occupied even at infinite dilution. The discrepancy between the implications of the XPS and XANES results is dealt with using a charge redistribution model in which s-p-d rehybridization takes place at both sites within the framework of electroneutrality and electronegativity considerations. It appears that both Ni and Cu gain a small but measurable amount of d charge in alloy formation through rehybridization (loss of non-d conduction charge). Possible connection between these results and the disappearance of ferromagnetism in Ni1-xCux alloys at x>0.6 is discussed.
關鍵字
語言英文
ISSN0163-1829;1095-3795
期刊性質國外
收錄於SCI
產學合作
通訊作者Pong, W. F.; Pieh, J. Y.
審稿制度
國別美國
公開徵稿
出版型式紙本;電子版
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