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本文报道了用铍过滤探测器谱仪对LaNi_(4.5)Mn_(0.5)H_x在三种不同氢含量时测量的中子非弹性散射谱。结果表明,Mn原子部分置换LaNi_5中的Ni原子后,使M—H键增强,当x=6时,高能段的第二、三振动峰分别向高频方向位移了6meV和10meV。该结果与LaNi_(4.5)Mn_(0.5)H_x的平台压力(P-C-T等温线)下降的宏观热力学性能相一致。
In this paper, the neutron inelastic scattering spectra of LaNi_ (4.5) Mn_ (0.5) H_x measured at three different hydrogen contents using beryllium filter detector spectrometer are reported. The results show that the Mn atom partially displaces the Ni atom in LaNi_5 and enhances the M-H bond. When x = 6, the second and third vibrational peaks of the high-energy segment are shifted to 6meV and 10meV respectively. The results are in agreement with the macroscopic thermodynamic properties of the decrease of the plateau pressure (P-C-T isotherm) of LaNi_ (4.5) Mn_ (0.5) H_x.