r3+-doped mullite transparent glass ceramic is a new material for tunable lasers and luminescent solar concentrators. Mullite transparent glass ceramic can be obtained from glass not containing any nucleator agents af...r3+-doped mullite transparent glass ceramic is a new material for tunable lasers and luminescent solar concentrators. Mullite transparent glass ceramic can be obtained from glass not containing any nucleator agents after appropriate heat treatment. In this paper, crystallization behavior of the above glass coramic was studied by XRD, IR and TEM. The results indicate that the crystallization mechanism can be assigned to phase separation and subsequent crystallization, and the ocurrence of mullite causes a new infared absorption peak in the range 600-630cm-1 in the IR spectra.展开更多
Nitrogen-doped TiO2 nanotubes array were synthesized to improve the photocatalytic efficiency by annealing the anodized titania nanotubes with ammonia at 500℃.Detailed structural analysis revealed that the nitrogen-d...Nitrogen-doped TiO2 nanotubes array were synthesized to improve the photocatalytic efficiency by annealing the anodized titania nanotubes with ammonia at 500℃.Detailed structural analysis revealed that the nitrogen-doped titania nanotubes are of highly ordered structure,and exhibit a decreased phase transformation temperature compared with those that are not doped,as evidenced by the decrease in full width at half maximum(FWHM)of the(110)peak of rutile phase and the occurrence of the typical Raman peaks of rutile phase at 196,235,442,610 cm -1 .According to the photocatalytic degradation of methyl orange under visible light irradiation,the nitrogen-doped TiO2 nanotubes exhibit enhanced photocatalytic efficiency compared with their non-doped nanotubes,which might be a result of either the nitrogen doping induced band gap narrowing or the synergistic effect produced by both nitrogen and fluorine dopants.展开更多
文摘r3+-doped mullite transparent glass ceramic is a new material for tunable lasers and luminescent solar concentrators. Mullite transparent glass ceramic can be obtained from glass not containing any nucleator agents after appropriate heat treatment. In this paper, crystallization behavior of the above glass coramic was studied by XRD, IR and TEM. The results indicate that the crystallization mechanism can be assigned to phase separation and subsequent crystallization, and the ocurrence of mullite causes a new infared absorption peak in the range 600-630cm-1 in the IR spectra.
基金Project(2008A430016)supported by the Foundation of Henan Education Department,Chinaprojects(50902125+1 种基金50872125)supported by the National Natural Science Foundation of Chinaproject supported by the China Postdoctoral Science Foundation
文摘Nitrogen-doped TiO2 nanotubes array were synthesized to improve the photocatalytic efficiency by annealing the anodized titania nanotubes with ammonia at 500℃.Detailed structural analysis revealed that the nitrogen-doped titania nanotubes are of highly ordered structure,and exhibit a decreased phase transformation temperature compared with those that are not doped,as evidenced by the decrease in full width at half maximum(FWHM)of the(110)peak of rutile phase and the occurrence of the typical Raman peaks of rutile phase at 196,235,442,610 cm -1 .According to the photocatalytic degradation of methyl orange under visible light irradiation,the nitrogen-doped TiO2 nanotubes exhibit enhanced photocatalytic efficiency compared with their non-doped nanotubes,which might be a result of either the nitrogen doping induced band gap narrowing or the synergistic effect produced by both nitrogen and fluorine dopants.
