Synthesis Of Rare Earth Oxides Quasi One Dimensional Nano Arrays And Magnetic Performances

One-dimensional magnetic nanoarrays have been become hot topics due to their potential application in high density magnetic storage media and nanodevice. In the thesis, we have investigated the magnetic performances of rare earth oxide nanotube and nanowire arrays with doping transition elements, controlling synthesis and heating treatment processes. The quasi one-dimensional rare earth oxide nanostructures were fabricated by suction filtration at subatmospheric pressure (SFSP).The main research and results are as follow:1、 Anodic alumina membrane with different nano pore sizes have been fabricated by two-step anodization in sulfuric, oxalic acid and phosphoric acid, respectively, and the influence factors of AAM template have been discussed.2、 Gd2O3and GdNixOy nanotube arrays have been synthesized in AAM template by SFSP. Hysteresis loops indicate that there are obvious magnetic anisotropy for GdNivO. nanotube arrays and Gd2O3nanotube arrays in the parallel and perpendicular direction, and the easily magnetized direction is parallel to the nanotube array. The shape anisotropy of GdNixOy nanotube arrays was enhanced significantly compared with Gd2O3nanotube arrays due to the Ni element doped.3、GdNixOy:Eu3+nanotube arrays are paramagnetic performance in H/7direction and superparamagnetic performance in H⊥direction owing to the Eu element doped. The GdNixOy:Eu3+nanotube arrays possess a strong broad emission peak corresponding to5D0-7F1transition at646nm under the excitation of394nm and the optimum doping concentration of Eu3+is8%.4、 The magnetic anisotropy of rare earth oxide nanotube arrays were related to its nanostructure and the processes of heat treatment. The shape anisotropy of GdNixOy nanotube arrays is stronger than that of GdNixOy nanwrie arrays, and the easily magnetized direction is parallel to the nanotube arrays. When GdNixOy nanotube arrays were annealed in a pipe furnace for4h at300,400,500,600,700,800,900℃, respectively, there is a maximum for its coercivity, remanence and squareness ratio in the H//direction at400℃.