Scandia and rhenium doped tungsten powders were prepared by solid-liquid doping combined with two-step reduction method. The particle size of doped tungsten and distribution of scandia and rhenium were studied by SEM,...Scandia and rhenium doped tungsten powders were prepared by solid-liquid doping combined with two-step reduction method. The particle size of doped tungsten and distribution of scandia and rhenium were studied by SEM, EDS, XRD and granularity analysis. Experimental results showed that scandia distributed evenly on the surface of tungsten particles. Addition of scandia and rhenium decreased the particle size of doped tungsten, and the more the content of scandia and rhenium, the smaller the doped tungsten particles. Tungsten powders doped with 3% Sc2O3 and 3% Re (mass fraction) had an average size of about 80 nm in diameter. The mechanism of the decrease in the tungsten particle size was discussed.展开更多
The Er3+-doped TeO2-WO3-ZnO-ZnF2（TWZOF） glasses were prepared. The absorption spectra, 1.5 μm emission spectra and fluorescence lifetimes of Er3+, excited at 970 nm, were measured. The J-O parameters Ω t （t =2, 4...The Er3+-doped TeO2-WO3-ZnO-ZnF2（TWZOF） glasses were prepared. The absorption spectra, 1.5 μm emission spectra and fluorescence lifetimes of Er3+, excited at 970 nm, were measured. The J-O parameters Ω t （t =2, 4, 6）, absorption and emission cross-sections were calculated. The dependence of the 1.5 μm emission intensity, fluorescence lifetime and bandwidth of the Er3+ emission upon the contents of ZnF2 in glass were investigated. In TWZOF glass, Er3+ ions had a broad emission profile around 1.5 μm with the maximum FWHM of 83 nm. With the increasing of the content of ZnF2, the emission intensity at peak wavelength and the fluorescence lifetime of Er3+ at 1.5 μm increase.展开更多
基金Project supported by the National Natural Science Foundation of China (50571001)the National "863"Project(2006AA03Z524)
文摘Scandia and rhenium doped tungsten powders were prepared by solid-liquid doping combined with two-step reduction method. The particle size of doped tungsten and distribution of scandia and rhenium were studied by SEM, EDS, XRD and granularity analysis. Experimental results showed that scandia distributed evenly on the surface of tungsten particles. Addition of scandia and rhenium decreased the particle size of doped tungsten, and the more the content of scandia and rhenium, the smaller the doped tungsten particles. Tungsten powders doped with 3% Sc2O3 and 3% Re (mass fraction) had an average size of about 80 nm in diameter. The mechanism of the decrease in the tungsten particle size was discussed.
文摘The Er3+-doped TeO2-WO3-ZnO-ZnF2（TWZOF） glasses were prepared. The absorption spectra, 1.5 μm emission spectra and fluorescence lifetimes of Er3+, excited at 970 nm, were measured. The J-O parameters Ω t （t =2, 4, 6）, absorption and emission cross-sections were calculated. The dependence of the 1.5 μm emission intensity, fluorescence lifetime and bandwidth of the Er3+ emission upon the contents of ZnF2 in glass were investigated. In TWZOF glass, Er3+ ions had a broad emission profile around 1.5 μm with the maximum FWHM of 83 nm. With the increasing of the content of ZnF2, the emission intensity at peak wavelength and the fluorescence lifetime of Er3+ at 1.5 μm increase.
