论文部分内容阅读
用EXAFS法,在室温下对晶态、非晶态Ti_2Cu合金及其氢化物中铜的K吸收限EXAFS谱进行了研究。用Teo和Lee给出的铜、钛的背散射振幅,中心原子铜的相移及背散射原子铜和钛的相移理论值进行拟合,得到了铜原子与近邻原子间的间距、配位数和Debye-Waller因子等结构参数。讨论了氢原子进入晶格间隙后对上述参数的影响,分析了氢原子在晶态、非晶态中占据的间隙位置。对金属原子成键特征、非晶态Ti_2Cu高吸氢量的原因作了初步探讨。
The EXAFS method was used to study the K absorption limit (EXAFS) spectra of copper in crystalline and amorphous Ti_2Cu alloys and their hydrides at room temperature. Using the backscattering amplitudes of copper and titanium given by Teo and Lee, the phase shift of the central atomic copper and the theoretical value of the phase shift of the backscattered atomic copper and titanium, the spacing and the coordination between the copper atom and the neighboring atoms were obtained Number and Debye-Waller factor and other structural parameters. The influence of hydrogen atoms on the above parameters is discussed. The positions of hydrogen atoms occupying in the crystalline and amorphous states are analyzed. The reasons for the bonding characteristics of metal atoms and the high hydrogen absorption capacity of amorphous Ti_2Cu were discussed.