The preferential sputtering and post-bombardment surface segregation for two-phase AgNi alloys at roan temperature by AES are reported It was found that Ag is the surface preferential sputtering element in the whole r...The preferential sputtering and post-bombardment surface segregation for two-phase AgNi alloys at roan temperature by AES are reported It was found that Ag is the surface preferential sputtering element in the whole range of composition. It was also found that there is an obvious post-展开更多
The structure of energy levels is the most important factor to determine the characteris-tic of solid. Single phase of high T_c superconductor YBa_2Cu_3O_x is investigated by the spec-troscopic method. The reflection-...The structure of energy levels is the most important factor to determine the characteris-tic of solid. Single phase of high T_c superconductor YBa_2Cu_3O_x is investigated by the spec-troscopic method. The reflection-absorption spectra, Raman spectra and fluorescence spectraof high T_c samples have been measured. The absorption bands of 350 and 500 nm and emis-sion bands of 390 and 560 nm are assigned to the transition between ~1A_(1g)(3d^(10)) to ~1E_g and^3E_g(3d^94s^1) of the emission center of Cu^+. The emission bands of 720 and 860 nm come fromthe emission center of Cu^(2+), which is considered to be the transition between five splittingenergy levels of the spectral term ~2D of free ions in octahedra and rhombic crystal fields. Inaddition, there are some bands that may come from the emission center of Cu^(3+) in the crystallattice. The presence of phonon pairs of 481 and 551 cm^(-1) indicates the strong coupling be-tween tbe phonon pair of 312 cm^(-1) and electron system.展开更多
文摘The preferential sputtering and post-bombardment surface segregation for two-phase AgNi alloys at roan temperature by AES are reported It was found that Ag is the surface preferential sputtering element in the whole range of composition. It was also found that there is an obvious post-
基金Project supported by the National Natural Science Foundation of China.
文摘The structure of energy levels is the most important factor to determine the characteris-tic of solid. Single phase of high T_c superconductor YBa_2Cu_3O_x is investigated by the spec-troscopic method. The reflection-absorption spectra, Raman spectra and fluorescence spectraof high T_c samples have been measured. The absorption bands of 350 and 500 nm and emis-sion bands of 390 and 560 nm are assigned to the transition between ~1A_(1g)(3d^(10)) to ~1E_g and^3E_g(3d^94s^1) of the emission center of Cu^+. The emission bands of 720 and 860 nm come fromthe emission center of Cu^(2+), which is considered to be the transition between five splittingenergy levels of the spectral term ~2D of free ions in octahedra and rhombic crystal fields. Inaddition, there are some bands that may come from the emission center of Cu^(3+) in the crystallattice. The presence of phonon pairs of 481 and 551 cm^(-1) indicates the strong coupling be-tween tbe phonon pair of 312 cm^(-1) and electron system.
