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.
