HYDROGEN ABSORBING ALLOY AND SECONDARY BATTERY
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United States of America Patent
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app pub date -
Apr 25, 2007
filing date -
Dec 27, 1999
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Abstract
The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCu.sub.5 type structure, wherein a content of a phase having a crystal structure of AB.sub.2 type is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below: R.sub.1-a-bMg.sub.aT.sub.bNi.sub.Z-X-Y-.alpha.M1.sub.XM2.sub.YMn.sub..alp-ha. (1)
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