Abstract
The thermodynamic properties of Zr(Fe x Mn 1− x ) 2 alloy hydrides ( x = 0–1) were studied by measuring the equilibrium dissociation pressures. When x is in the range 0–0.8, Zr(Fe x Mn 1− x ) 2 alloys readily occlude hydrogen at pressures below 0.1 MPa at room temperature without requiring any activation. The cyclic stabilities of the present alloys are so good that no irreversible phase separation is observed after numerous hydrogen absorption-desorption cycles. The dissociation pressures of the hydrides increase as the lattice parameters of the alloys decrease. When x = 1 this formula corresponds to ZrFe 2 which is essentially inactive to hydrogen. The alloy hydrides show sloping plateaux and this phenomenon is not significantly affected by heating the parent alloys to 1300 K in an argon atmosphere. As the square root of the equilibrium pressure has a linear relationship with the hydrogen concentration, the sloping plateaux observed here are believed to be inherent.
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