摘要
本文首先报道C-15结构超导合金HfV2的贮氢特性。氢合金HfV2·Hx中1H核的磁共振研究包括:低温相1H NMR刚性偶极展宽二次矩的实验测定及理论计算对比,论证中子衍射实验所标定低温相结构参数合理;NMR线宽—温度依赖及1H自扩散激活能的确定;基于合理扩散行步模型计算扩散系数,从而较全面地提供描述1H扩散行为的一套参数值。
Some characteristics of hydrogen storage of C-15 structure superconducting alloy HfV_2 are reported. The NMR studies on ~IH in HfV_2·H_x include a contrast between the experimental obser- vation and the theoretical calculation of ~IH NMR second moment. The ~IH NMR was ob- served at relative low temperature for which the hydrogen atoms had been frozen in the host lat- tice. The ~IH NMR aignal showed a broad spectrum, by which a careful computer simulation gave the experimental analytic value of the second moment. The theoretical value of the NMR second moment of the rigid lattice dipolar interaction was based on the informations had been offered by the neutron diffrections. There is a resonable agreement between the experiment and the theoretical calculation. Along with the temperature increasing, the diffusion movement of the hydrogen in host lat- tice became rapidity which caused the resonance line narrowing. According to the line width-temperature depdndency observed a suit of coefficients describing the behaviour or the hydrogen diffusion in the host lattice are determined namely the attempted frequency, the activation energy and the diffusion constant.
基金
国家自然科学基金
