Hydrogen storage alloy

Abstract

A hydrogen storage alloy having a body-centered cubic structure phase capable of storing and releasing hydrogen as its main phase, and a composition of the general composition formula: Ti (100-a-0 4b) Cr (a-0.6b) V (b-c) M c , wherein 20≦a (at %)≦80, 0≦b (at %)≦10, and 0≦c (at %)<5; and M is at least one element of Mo and W.

1 . A hydrogen storage alloy having the following characteristics: 
 (1) it has as its main phase a body-centered cubic structure phase capable of absorbing, storing and releasing hydrogen, and    (2) it has a composition of the following general composition formula:    Ti (100-a-0 4b) Cr (a-0 6b) V (b-c) M c      wherein 20≦a (at %)≦80, 0≦b (at %)≦10, and 0≦c (at %)<5, and m is at least one element selected from molybdenum (Mo) and tungsten (W):    
     
     
         2 . The hydrogen storage alloy according to  claim 1  which contains an element X having an atomic radius larger than Cr and smaller than Ti at a range of 0≦d (at %)≦20, provided that d is an atom % concentration (at %) of X.  
     
     
         3 . The hydrogen storage alloy according to  claim 1  or  2  which contains at least one or more elements (T) selected from Nb, Ta, Mn, Fe, Al, B, C, Co, Cu, Ga, Ge, Ln (various lanthanoid metals), N, Ni, P and Si at a range of 0≦e (at %)≦10, provided that e is an atom % concentration (at %) of T.