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The electroless Ni-P-carbon nanotubes composite plating was studied on the copper substrate. Metallurgical microscope, scanning electronic microscope, X-ray diffractometer and micro hardness tester were used to study the structure, constitution and performance of the electroless Ni-P-carbon nanotubes composite deposit. Experiential results show that, with the increment of carbon nanotubes content in electroless plating solution, the grain size on the sample surface decreases whereas the density of grains and the hardness for composite deposit increases. Moreover, adding carbon nanotubes not only improves the degree of crystallization for the composite deposit but also helps their transformation from the amorphous state to the nanocrystal state. 相似文献
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钒氢化物电子结构的量子化学研究 总被引:2,自引:0,他引:2
利用电荷自洽离散变分Xα(SCC-DV-Xα)方法计算了钒基固溶体中钒氢反应前后钒及其氢化物(VHx, x=0, 1, 2)、假定原子簇模型VHx*(x=1, 2)和VHx′(x=0, 1)的电子结构. 结果表明:钒与氢气反应生成VH时, 化学效应和结构效应都使V 3d和H 1s轨道向低能量方向移动, 氢化物VH中V 3d和H 1s轨道重叠最多, V-H之间的相互作用较强。VH再与氢气反应生成VH2时, 结构效应使V 3d和H 1s轨道都向高能量方向移动, 氢化物VH2中V 3d和H 1s轨道重叠最少, V和H之间的相互作用较弱。氢化物VH和VH2中不仅存在离子性相互作用, 而且还存在共价性相互作用. 结构效应导致VH2中V-H键的共价性减弱, 从而导致VH2中V和H之间的相互作用减弱. 氢化物VH的费米能级比VH2的低, 说明VH更稳定. 相似文献
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