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Study on interface of Al/depleted uranium and Au/depleted uranium layers deposited by magnetron sputtering

Yi Tai-Min Xing Pi-Feng Zheng Feng-Cheng Mei Lu-Sheng Yang Meng-Sheng Zhao Li-Ping Li Chao-Yang Xie Jun Du Kai Ma Kun-Quan

Study on interface of Al/depleted uranium and Au/depleted uranium layers deposited by magnetron sputtering

Yi Tai-Min, Xing Pi-Feng, Zheng Feng-Cheng, Mei Lu-Sheng, Yang Meng-Sheng, Zhao Li-Ping, Li Chao-Yang, Xie Jun, Du Kai, Ma Kun-Quan
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  • Received Date:  21 June 2012
  • Accepted Date:  24 December 2012
  • Published Online:  05 May 2013

Study on interface of Al/depleted uranium and Au/depleted uranium layers deposited by magnetron sputtering

  • 1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 51006093).

Abstract: Aluminum/depleted uranium/aluminum (Al/DU/Al) and gold/depleted uranium/gold (Au/DU/Au) "sandwich structure" films are deposited by magnetron sputtering. Diffusions of Al/DU and Au/DU interface of these samples are investigated by high resolution scanning electronic microscope, X-ray diffraction, X-ray photoelectron spectrometer and scanning auger microprobe. The results show that deposited DU layer is of columnar grain. Significant diffusion takes place at Al/DU interface. Intermetallic compounds of Al2U and Al3U are formed at Al/DU interface by chemical reaction between Al and DU which induces chemical shift toward high binding energy of Al 2p and toward low binding energy of U 4f. Microdosages of O exist in Al over-layers as Al2O3, in Al/DU interface as Al2O3 and oxidation of uranium, and in DU layers as oxidation of uranium respectively. Just simple physical diffusion takes place at Au/DU interface. Binding energies of Au 4f and U 4f shift toward high-energy tail induced by cluster effect at the Au/DU interface. Microdosages of O exist at Au/DU interface and in DU layers as oxidation of uranium. Diffusion at the Al/DU interface is more obvious than at Au/DU surface. Under the condition of the same thickness valuses Al over-layer is more effective than Au over layer to protect uranium layer from oxidging.

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