Structrure And Properties Of Zirconium Titanium Nanooxides

In this thesis, Zr-Fe alloys with different contents of iron were prepared by vacuum method, and zirconium iron oxide nanotube arrays have been achieved directly by anodizing the Zr–Fe alloy. The morphologies, structures, magnetism and absorption properties of the samples were investigated by SEM, XRD, VSM, XPS and UV-Vis analyses. In addition, zirconium-iron composite oxides and titanium-iron composite oxides with different contents of iron were prepared by chemical coprecipitation method, and their properties were studied to make a comparison with those of zirconium iron oxide nanotube arrays.1. Zirconium-iron oxide nanotube arrays were prepared in GE/FA mixed electrolytes containing 1 wt% H2 O and 1 wt% NH4 F by anodization method. The effect of the iron content on the crystal temperature and crystal structure of the composite oxide nanotubes was studied. Results showed that,with the increasing of iron content, the zirconium-iron oxides crystallization temperature increased from 400℃to 600℃, the crystal particle size decreased significantly, and the content of tetragonal ZrO2 improved obviously.2. The magnetism of zirconium iron oxide nanotube arrays were investegated, in particular, the effect of the annealed temperature on the samples,magnetism were studied. Results showed that the increase in annealed temperature led to the different magnetism.3. The band gap and adsorption properties of the zirconium iron oxide nanotube arrays were studied. Studies show that, with the increasing iron content, absorption band edge redshift phenomenon happened, and the adsorption properties of the zirconium-iron oxide nanotube arrays were better than those of pure oxide nanotube arrays.4. Results indicate that compared with single zirconium oxide or iron oxide, the zirconium-iron oxides exhibited a higher crystallization temperature and a decreased crystal particle size. When the content of iron increased the magnetization increased. When the Zr/Fe ratio was 1:2 or 1:3, the coercive forces of zirconium-iron oxide were similar to iron oxide, moreover the remanence and saturated magnetization were more than that of iron oxide. With the different Zr/Fe molar ratios, the adsorption capacities of zirconium-iron oxides were different and all better than that of zirconium oxide and iron oxide.5. The adsorption properties of the unannealed titanium iron oxide were studied and compared with those of titanium iron oxide annealed at 550℃, results show that the adsorption properties of the unannealed titanium iron oxide were better that those of titanium iron oxide annealed at 550℃.