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Isotope separation using metal hydride under magnetic fields

在磁场下使用金属氢化物分离同位素

基本信息

批准号：
14350041
负责人：
YAMAGUCHI Masuhiro
金额：
$ 9.22万
依托单位：
National University Corporation Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The magnetic field effects on the isotope separation were investigated for the ferromagnetic metal hydrides RCo_5(R=La,Ce,Pr,Nd,Sm,Gd,Tb,Dy and Er) and the paramagnetic LaNi_5. The pressure-composition isotherms were measured for all the hydrides and deuterides. The thermodynamic parameters, ΔH and ΔS were calculated from the experimental data. The hydrogen and deuterium composition dependencies of the magnetization were measured for all systems.LaCo_5,PrCo_5 and GdCo_5 showed a large isotope effect on the equilibrium pressure. These deuterium pressure were twice the hydrogen pressure. The magnetizations of the hydride and the deuteride were the same for all measured systems. The experimental results indicated the difference between the hydrogen and deuterium pressure is increased exponentially with increasing magnetic field for only ferromagnetic systems.The reacted gas was analyzed after the reaction between the metal and the mixed gas of hydrogen and deuterium. The mass spectrometer showed no magnetic field effects for the paramagnetic LaCo_5 system. But the ferromagnetic LaCo_5 absorbed selectively hydrogen gas and the reacted gas contained rich deuterium. The ratio of deuterium in the reacted gas was increased with increasing magnetic field. The percentage of deuterium increased by 6% under the influence of magnetic field of 13T.The change in the electronic structure of the hydrides and the deuterides were investigated by Compton scattering measurement. The electron momentum density and Fermi energy were observed experimentally for the hydrides and deuterides of Pd,V,Mg_2Ni.

研究了铁磁性金属氢化物RCO5(R=La、Ce、Pr、Nd、Sm、Gd、Tb、Dy和Er)和顺磁性LaNi5的磁场对同位素分离的影响。根据实验数据计算了热力学参数ΔH和ΔS。测量了所有体系的氢和氚组成对磁化强度的依赖关系。LaCo5、PrCo5和GdCo5对平衡压力有很大的同位素效应。这些氢气压力是氢气压力的两倍。所有被测体系的氢化物和氢化物的磁化强度都是相同的。实验结果表明，对于纯铁磁系统，氢气和氢气的压差随磁场的增大呈指数增大。质谱计对顺磁LaCO5体系没有磁场效应。但铁磁性LaCO_5选择性地吸附氢气，反应气体中含有丰富的氢。随着磁场的增大，反应气体中的氚比例增大。在13T磁场作用下，氢的百分含量增加了6%。用康普顿散射方法研究了氢化物和氢化物电子结构的变化。实验观测了Pd、V、Mg_2Ni氢化物和氢化物的电子动量密度和费米能量。