LaNi5の水素化特性におよぼすFeおよびCr置換の影響

三沢 俊平, 能町 暁彦, 矢島 聖使, 菅原 英夫

doi:10.2320/jinstmet1952.43.2_104

A study has been made on the formation and dissociation characteristics of hydrides in LaNi₄Fe, LaNi_2.5Fe_2.5 and LaNi₄Cr which are substituted for 20 or 50 at% of the Ni in LaNi₅ by Fe or Cr. The results obtained are as follows : (1) The enthalpy changes ΔH for the dissociation of the hydrides in LaNi₅, LaNi₄Fe, LaNi_2.5Fe_2.5 and LaNi₄Cr determined from the measurements of dissociation pressure-composition isotherms are −32.7, −34.5, −37.2 and −34.0 kJ/mol H₂, respectively. (2) The substitutions of Fe and Cr which form the hydrides with lower values of ΔH than that in LaNi₅ lead to lower plateau dissociation-pressures, although the Fe and Cr substitutions lead to a shorter plateau corresponding to the concentration of storaged hydrogen. (3) LaNi₄FeH_3.5, LaNi_2.5Fe_2.5H_1.6 and LaNi₄CrH_1.8 are formed at 0.1 MPa (1 atm) of dissociation hydrogen corresponding to atmospheric pressure at 25°C, and the application of these metal hydrides as hydrogen storage media is discussed. (4) The evolution process of hydrogen dissociated from the hydride of LaNi₄Cr, with the formation of holes through an Au thin-film evaporated onto the surface of a hydrided sample, was observed in vacuum on a scanning electron microscope.

LaNi<SUB>5</SUB>の水素化特性におよぼすFeおよびCr置換の影響

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