Hydrogen storage alloys having reduced pct hysteresis

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A modified A2B7 type hydrogen storage alloy having reduced hysteresis. The alloy consists of a base AxBy hydrogen storage alloy, where A includes at least one rare earth element and also includes magnesium, B includes at least nickel, and the atomic ratio of x to y is between 1 : 2 and 1 : 5. The base alloy is modified by addition of a modifier element having a relatively small atomic volume such that degree of disorder of the A2B7 alloy is increased, and the absorption/desorption hysteresis of the modified alloy is reduced by at least 10% as compared to the base alloy.