Hydrogen storage alloys having reduced PCT hysteresis
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United States of America Patent
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Issued Date -
Mar 16, 2006
app pub date -
Sep 16, 2004
filing date -
Sep 16, 2004
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Abandoned
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Abstract
A modified A.sub.2B.sub.7 type hydrogen storage alloy having reduced hysteresis. The alloy consists of a base A.sub.xB.sub.y 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 the addition of at least one modifier element which has an atomic volume less than about 8 cm.sup.3/mole, and is added to the base alloy in an amount sufficient to reduce the absorption/desorption hysteresis of the alloy by at least 10% when compared with the base alloy.
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