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Hydrogen Absorption and Desorption of Alloys Under the Influence of Magnetic Fields

磁场影响下合金的吸氢和解吸

基本信息

批准号：
01550008
负责人：
YAMAGUCHI Masuhiro
金额：
$ 1.28万
依托单位：
Faculty of Engineering, Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

The equilibrium hydrogen pressure was observed as a function of the magnetic field for three systems including ferromagnetic hydrides, LaCo_5-H, GdCo_5-H and Y_2Co_7-H systems. The change in magnetization per reacted hydrogen (DELTAMs) determines the shift of change in the chemical equilibrium and then the change in pressure. The results can be explained using a magnetic data.LaCo_5Hx (X=4.2, the beta+gamma twoーphase region) : The equilibrium hydrogen pressure was measured as a function of the magnetic fields up to 26T at 293K. The pressure was increased with increasing fields : 1.2X10^4Pa in zero fields and 1.8X10^4Pa in 26T. This corresponds to 67% decrease in the equilibrium constant. The logarithmic pressure change, LPC, was not proportional to the field. This behavoir is explained by the magnetization observed in pulsed magnetic fields up to 28T. DELTAMs was increased with increasing magnetic field.GdCo_5Hx (X=1.34, 1.35, 2.52 and 2.53, alpha+beta region) : The equilibrium hydrogen pressure was measured in the magnetic fields up to 14T at 288K. The hydrogen was absorbed with the fields because of a negative value of DELTAMs.Y_2Co_7Hx (X=2-3, the beta single phase) : This system is investigated in the single region but not in the twoーphase region. The equilibrium hydrogen pressure vs. fields was measured at several initial hydrogen pressures, Pi, at 348K. The results were classified into two groups. (1)For Pi more than 86kPa, the LPC scarcely depends on the magnetic field because the magnetization is independent of the pressure in this region. (2)For Pi less than 24kPa, the LPC is decreased with increasing fields until 6T but becomes saturated in higher fields. This saturation was attributed to the metamagnetism occurring in 5.6T in the lower composition hydride of the beta phase.

本文对铁磁铁氧体、LaCo_5-H、GdCo_5-H和Y_2Co_7-H三个体系的平衡氢压随磁场的变化进行了研究。每反应氢的磁化强度变化（DELTAMs）决定了化学平衡变化的偏移，然后决定了压力变化。LaCo_5Hx（X=4.2，β + γ两相区）：在293 K下测量了平衡氢压随磁场的变化，磁场强度达26 T。压力随磁场的增加而增加：零磁场为1.2 × 10^4Pa，26 T为1.8 × 10^4Pa。这相当于平衡常数降低67%。对数压力变化，LPC，是不成比例的字段。这一现象可以用在高达28 T的脉冲磁场中观察到的磁化强度来解释。GdCo_5Hx（X=1.34，1.35，2.52和2.53，α + β区）：在288 K下，在14 T的磁场中测量了平衡氢压。Y_2Co_7Hx（X=2-3，β单相）：在单相区研究了该体系，但在两相区没有研究。在348 K下，在几个初始氢压Pi下测量了平衡氢压与场的关系。结果分为两组。（1）当Pi大于86 kPa时，LPC几乎不依赖于磁场，因为该区域的磁化强度与压力无关。（2）当Pi小于24 kPa时，LPC随磁场的增大而减小，直到6 T，但在更高的磁场下，LPC趋于饱和。这种饱和归因于在β相的较低组成氢化物中在5.6T下发生的变磁性。