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研究了元素Y(钇)对La_(1-x)Y_xNi_(4.8)Mn_(0.2)(x=0.6,0.7,0.8)合金储氢性能的影响,结果表明:La_(1-x)Y_xNi_(4.8)Mn_(0.2)合金为CaCu_5型六方结构;随着Y含量的增加,晶格参数a和晶胞体积V减小,而c几乎不变,c/a线性增大;随着Y含量的增加,合金的吸放氢平台压显著升高,吸氢量减少,吸放氢平台斜率S和滞后系数_f略有增加,滞后系数H_f与XRD(111)峰的半高宽(FWHM)值的变化有着很好的对应关系,抗粉化性能提高。当Y含量x=0.8时,合金的吸放氢动力学综合性能最好。
The effect of element Y on the hydrogen storage properties of La_ (1-x) Y_xNi_ (4.8) Mn_ (0.2) (x = 0.6,0.7,0.8) alloys was investigated. The results show that the La_ (1-x) Y_xNi_ (4.8) ) Mn_ (0.2) alloy is a CaCu_5-type hexagonal structure. With the increase of Y content, the lattice parameter a and the unit cell volume V decrease while c is almost constant, while the c / a increases linearly. With the increase of Y content , The hydrogen storage pressure of the alloy increases significantly, the amount of hydrogen absorption decreases, the slope S of the hydrogen absorption-desorption platform and the lag coefficient _f increase slightly, and the lag coefficient H_f and FWHM of the XRD (111) peak Change has a good correspondence between anti-chalking performance. When the content of Y is x = 0.8, the kinetics of hydrogen absorption and desorption is the best.