氢在非晶态合金MmNi_(4.5)Mn_(0.5)中的扩散

Hydrogen Diffusion in Amorphous MmNi_(4.5) Mn_(0.5) Film

合金MmN1_(4.5) Mn_(0.5) (Mm代表混合稀土元素)被认为是目前最有实际应用前景的贮氢材料,其晶态贮氢过程的研究,已有过报道。本文用电化学方法研究氢在非晶态MmNi_(4.5) Mn_(0.5)的扩散行为。 用真空蒸镀的方法,把合金MmNi_(4.5) Mn_(0.5)蒸镀到厚度为0.040mm的钯片上。

The MmNi_(4.5)Mn_(0.5) (Mm. misch rare earth elements) thin film was prepared by conventional vacuum deposition technique. MmNi_(4.5)Mn_(0.5) powder was placed on tantalum boat which was preheated at a temperature of;1400℃.All the component of MmNi_(4.5)Mn_(0.5) evaporated immediately at this temperature and was deposited onto a cleaned palladium film (0.040mm) which was-placed just: above the tantalum boat. Analysis of the film was performed by means of X-ray fluorescence spectroscopy and it was confirmed that the composition was MmNi4 5 Mn_(0.5). It was shown by X-ray diffraction spectroscopy that the MmNi_(4.5) Mn_(0.5) film was amorph-cus alloys.The diffusion coefficient of hydrogen in the film at ambient temperature has been studied with electrpchmical technique. The diffusion coefficient D of hydrogen in amorphous MmNi4 5 Mn_(0.5) alloy film was determined, the value of D is (2.46±0.36) ×10-7cm2/s.