以X光吸收光譜研究Cu-Ni合金之電子結構

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Title:	以X光吸收光譜研究Cu-Ni合金之電子結構
Other Titles:	The electronic structure of Cu-Ni alloys studied by X-ray absorption spectroscopy
Authors:	吳佳澤;Wu, Chia-Tse
Contributors:	淡江大學物理學系碩士班張經霖
Keywords:	X光吸收光譜;Cu-Ni合金;熱電材料;x-ray absorption spectroscopy;XANES;Cu-Ni alloys;thermoelectric material
Date:	2016
Issue Date:	2017-08-24 23:38:17 (UTC+8)
Abstract:	我們以X光吸收光譜對不同濃度比例的Cu1-xNix合金（x=0.2，0.3，0.4，0.5）進行有系統之研究。在Cu的K-edge光譜中，Cu 4p空軌域隨著Ni濃度的增加而上升，而Cu 3d-4p空軌域會隨著Ni濃度的增加而下降。在Ni的K-edge光譜中，Ni 4p空軌域會隨著Ni濃度的增加而上升，而Ni 3d-4p空軌域隨著Ni濃度的增加而沒有明顯變化。由Cu的L3-edge面積積分顯示，隨著Ni濃度的增加，x>0.3的樣品，Cu 3d空軌域會有序下降。由Ni的L3-edge面積積分顯示，隨著Ni濃度的增加，x>0.3的樣品，Ni 3d空軌域會有序下降。根據實驗結果得到推測，Cu1-xNix合金隨著Ni濃度的增加，會有電子由4p軌域轉移至3d軌域的現象，進而使導電率和熱導率下降，並且由L3-edge面積積分與熱電力的比較，我們發現了Cu 3d空軌域數目的改變量會與熱電力之結果有相關聯。 We have performed x-ray absorption near edge structure (XANES) study on a series of thermoelectric Cu-Ni alloys samples. Cu K-edge spectra indicate that the Cu 4p unoccupied state increases as Ni concentration increases. Ni K-edge spectra indicate that the Ni 4p unoccupied state increases as Ni concentration increases. When Ni concentration x is great than 0.3, Cu 3d and Ni 3d unoccupied states as indicated by the L3-edge absorption intensity, both decrease with increasing Ni concentration. We speculate that Cu 4p-to-3d and Ni 4p-to-3d electronic transfers are responsible for the decreased electric and thermal conductivity. From Cu L3-edge spectra, the absorption intensity indicate that the variation in Cu 3d unoccupied state is related to thermopower.
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