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External Magnetic Field Induced Synthesis and Growth Mechanism of Ferromagnetic Metallic Materials

Author: JiRuiPing
Tutor: JiangJiSen
School: East China Normal University
Course: Materials Physics and Chemistry
Keywords: External magnetic field Liquid phase reduction Magnetic flux distribution Ferromagnetic metal Morphology Control Ion concentration Concentration ratio
CLC: TG14
Type: Master's thesis
Year: 2011
Downloads: 56
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Abstract


The application performance of the material has a close relationship with its microscopic size and morphology, materials researchers at home and abroad on the morphology of the material within the micro / nano-scale control maintained a high degree of attention. In recent years, because of the special properties and potential applications, ferromagnetic metal materials (iron, diamond, nickel, etc.) has been extensively studied. In this thesis, the applied magnetic field on nickel single quality drill single mass, and the morphology of the nickel - cobalt alloy material impact, the growth mechanism and ferromagnetic metal material in an external magnetic field analysis of the system. 1. Applied magnetic field magnetic force line distribution of the impact on the nickel metal material morphology generate nickel single quality crystals in the non-template liquid restore system study chemical reaction processes, the applied magnetic field of the magnetic force line distribution of the impact on the morphology found in the external magnetic field magnetic line distribution uniform area, to generate - dimensional structure of a nickel single quality crystals; in the external magnetic field magnetic line distribution uneven areas to generate spherical particles of nickel single quality crystals and on the basis of experimental observations, proposed a nickel single quality crystal material in the applied magnetic field of the growth mechanism. A saturation magnetization of the sample of approximately 50 emu ·-g-1, the coercive force is about 100 Oe, both close to the corresponding data with massive nickel crystals. These data further to determine the one-dimensional structure of nickel crystals are assembled by the spherical particles of the nickel crystals. 2. Applied magnetic field the cobalt crystal morphology study under the conditions of 60 ° C., with a non-template liquid phase reduction method to obtain cobalt elemental crystals. The study found: the distribution of the strength of the applied magnetic field and the magnetic field lines, the self-generated magnetic field, the ferromagnetic material's intrinsic magnetic properties, the number of particles of ferromagnetic material etc will affect the morphology of the external magnetic field of ferromagnetic material. Since the metal drill saturation magnetization (150.4 emu · g-') is much larger than the saturation magnetization of the metallic nickel (50 EMU · g-'), after the applied magnetic field after the magnetization of the cobalt crystals larger magnetic field. The applied magnetic field required to overcome these self-generated magnetic field can affect the role of diamond crystal morphology. When the external magnetic field magnetic field strength larger when the magnetic field lines in the different regions of the applied magnetic field distribution of the morphology of the cobalt crystal's have significantly with influence: in the external magnetic field magnetic line distribution uniform area, generate a one-dimensional morphology of the cobalt single quality crystals; in plus magnetic field lines of the uneven distribution of the region, to generate a particulate cobalt single quality crystals. Under the ideal conditions of the synthesis of good one-dimensional structure of ferromagnetic material in an applied magnetic field that is: the ferromagnetic material itself, a small saturation magnetization, prepared using the magnetic field strength parallel to the applied magnetic field, and a low ionic concentration. 3 under an applied magnetic field the Ni2 / Co2 ion concentration ratio of nickel - cobalt alloy Morphology in the applied magnetic field induced by using a non-template liquidus restore method of nickel - cobalt alloy, by changing the ion concentration ratio of Ni2 / Co2 The obtained morphology different product. The results found that the, Ni2 / Co2 ion concentration ratio 1:2,1:1 and 2:1 are hexagonal close-packed phase (hcp) phase and face-centered cubic (fcc) the mixed phase nickel - cobalt alloy. When the the Ni2 / Co2 ion concentration ratio smaller when the applied magnetic field to weak influence on the morphology; Ni2 / Co2 ion concentration ratio is large when the external magnetic field has a significant effect on the morphology: evenly distributed in the external magnetic field lines of the area generate - dimensional morphology of nickel - cobalt alloys; uneven regional distribution of the applied magnetic field lines, mainly generated particulate nickel - cobalt alloy.

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