电沉积法制备的泡沫镍的晶体结构与磁性能
Microstructure and magnetic properties of electrodeposited foamed nickel
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摘要: 采用X射线衍射仪、振动样品磁强计分别测试了电沉积法制备的泡沫镍的晶体结构和磁性能，研究了电流密度、温度、占空比、脉冲频率对镍沉积层的晶体结构和磁性能的影响；并用扫描电子显微镜、透射电子显微镜观察了泡沫镍的组织结构与微观形貌。制备出的3维网络状泡沫镍密度为0.25 g/cm3，孔隙率为97.5%、孔径分布为400～500 μm。沉积层大颗粒粒径为1 μm，沉积层晶粒尺寸在10nm以下;泡沫镍为超顺磁材料，具有低的矫顽力和高的磁导率，其磁导率和饱和磁化强度随沉积层晶粒尺寸的增加而增大。Abstract: The foamed nickel was synthesized by electrodeposition technique. The effect of current density, temperature, duty cycle and pulse frequency on crystal texture and magnetic properties of deposits were studied. The structure and micro-morphology were observed by scanning electron microscope and transmission electron microscope, respectively. Three-dimensional network foamed nickel with density of 0.25 g/cm3, porosity of 97.5 %, pore diameter ranged from 400 to 500 μm was prepared. Test results show that the big particles of deposits are was 1 μm in size and the crystallite size of deposits does not exceed 10 nm. The foamed nickel with low coercive force and high magnetic conductance is paramagnetic, and its magnetic conductivity and saturation magnetization rise with the increase of depo
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Key words:
- foamed nickel /
- electrodeposit /
- crystal structure /
- magnetic properties
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