(JP10183279-A)      The alloy composition includes 100 parts by weight of a LnNi5 type hydrogen absorbing alloy, wherein Ln represents at least one rare earth element, and 0.2 to 20 parts by weight of at least one rare-earth hydroxide. The rare-earth hydroxide is a hydroxide represented by R1 (CH)3 where R1 is selected from the group consisting of Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    The rare-earth compound as the first component is at least one compound oxide or compound hydroxide, which comprises at least one rare earth element selected from the group consisting of La, Ce, Pr, Nd, Y Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    ADVANTAGE -   Provides high capacity and long service life upon repetition of alternate absorption and desorption.    (JP10183280-A)      The alloy composition includes 100 parts by weight of a LnNi5 type hydrogen absorbing alloy, wherein Ln represents at least one rare earth element, and 0.2 to 20 parts by weight of at least one rare-earth hydroxide. The rare-earth hydroxide is a hydroxide represented by R1 (CH)3 where R1 is selected from the group consisting of Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    The rare-earth compound as the first component is at least one compound oxide or compound hydroxide, which comprises at least one rare earth element selected from the group consisting of La, Ce, Pr, Nd, Y Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    ADVANTAGE -   Provides high capacity and long service life upon repetition of alternate absorption and desorption.    (US6106769-A)      The alloy composition includes 100 parts by weight of a LnNi5 type hydrogen absorbing alloy, wherein Ln represents at least one rare earth element, and 0.2 to 20 parts by weight of at least one rare-earth hydroxide. The rare-earth hydroxide is a hydroxide represented by R1 (CH)3 where R1 is selected from the group consisting of Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    The rare-earth compound as the first component is at least one compound oxide or compound hydroxide, which comprises at least one rare earth element selected from the group consisting of La, Ce, Pr, Nd, Y Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.    ADVANTAGE -   Provides high capacity and long service life upon repetition of alternate absorption and desorption.