preparationno alloy zr ti mn fe u00b0 c no min u00b0 c hrs gm __________________________________________________________________________i zr sub 0 8 ti sub 0 2 mnfe 1 702 0 223 1 409 1 302 u02dc 1500 5 3 u02dc 1000 2 015ii zr sub 0 8 ti sub 0 3 mnfe 1 534 0 345 1 591 1 342 u02dc 1500 5 3 u02dc 1000 2 016iii zr sub 0 75 ti sub 0 25 mn sub 1 1 fe sub 0 9 1 500 0 263 1 325 1 102 u02dc 1500 5 3 u02dc 1000 2 015__________________________________________________________________________ table ii__________________________________________________________________________lattice parameters and hydrogen absorption for zr sub 1 x ti sub xmn sub 2 y fe sub y quaternary alloys change in hydrogen storage capacity lattice alloy volume ml h sub 2 persample alloy parameters unit cell volume in forming hydride gm alloyno alloy hydride a u00e5 c u00e5 v u00e5 sup 3 u03b4v v 7 atm 15 atm 40__________________________________________________________________________ atmi zr sub 0 8 ti sub 0 2 mnfe 4 980 8 163 175 3 19 0 190 203 209 zr sub 0 8 ti sub 0 2 mnfeh sub 3 0 5 284 8 628 208 6ii zr sub 0 7 ti sub 0 3 mnfe 4 958 8 111 172 7 20 2 144 149 149 zr sub 0 7 ti sub 0 3 mnfeh sub 2 0 5 271 8 623 207 5iii zr sub 0 75 ti sub 0 25 mn sub 1 1 fe sub 0 9 4 991 8 174 176.