The new preparation method of scandium bearing master alloys, in which scandium oxide was fluorinated by reaction with NH 4HF 2 and then reduced by aluminum magnesium in fused salt containing alkali and alkaline f...The new preparation method of scandium bearing master alloys, in which scandium oxide was fluorinated by reaction with NH 4HF 2 and then reduced by aluminum magnesium in fused salt containing alkali and alkaline fluoride under atmosphere, was studied. The effect of sorts of metallic reductive and technique conditions such as reducing temperature and time on the recovery of Sc was discussed. When the liquid aluminum magnesium was used as the reductive agent, the all recovery exceeds 80% and the concentration of Sc in master alloy prepared exceeds 1.9%. The best reducing reaction temperature and time are 1100 K and 40 min respectively. The newly produced Sc from reduction combines with Al to produce the stable compound Al 3Sc, so the reduction progress is sustained and the recovery of Sc is increased.展开更多
Lanthanide-doped ultrasmall nanoparticles(NPs)are attractive for diverse applications because of their unique optical properties compared with their bulk materials;their practical use,however,is greatly limited by ext...Lanthanide-doped ultrasmall nanoparticles(NPs)are attractive for diverse applications because of their unique optical properties compared with their bulk materials;their practical use,however,is greatly limited by extremely weak photoluminescence(PL)associated with severe surface quenching.Herein,we demonstrate an effective strategy to activate surface dark emitters of Eu3+in ultrasmall Sc_(2)O_(3).展开更多
文摘The new preparation method of scandium bearing master alloys, in which scandium oxide was fluorinated by reaction with NH 4HF 2 and then reduced by aluminum magnesium in fused salt containing alkali and alkaline fluoride under atmosphere, was studied. The effect of sorts of metallic reductive and technique conditions such as reducing temperature and time on the recovery of Sc was discussed. When the liquid aluminum magnesium was used as the reductive agent, the all recovery exceeds 80% and the concentration of Sc in master alloy prepared exceeds 1.9%. The best reducing reaction temperature and time are 1100 K and 40 min respectively. The newly produced Sc from reduction combines with Al to produce the stable compound Al 3Sc, so the reduction progress is sustained and the recovery of Sc is increased.
基金support by the Strategic Priority Research Program of the Chinese Academy of Sciences(no.XDB20000000)the National Natural Science Foundation of China(nos.21871256 and 21731006)+2 种基金the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(no.QYZDY-SSWSLH025)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(no.Y201747)the China Postdoctoral Science Foundation(no.2020T130652).
文摘Lanthanide-doped ultrasmall nanoparticles(NPs)are attractive for diverse applications because of their unique optical properties compared with their bulk materials;their practical use,however,is greatly limited by extremely weak photoluminescence(PL)associated with severe surface quenching.Herein,we demonstrate an effective strategy to activate surface dark emitters of Eu3+in ultrasmall Sc_(2)O_(3).
