Structural change of NdNi3 during hydrogen absorption-desorption cycle
Structural change of NdNi3 during hydrogen absorption-desorption cycle
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DOI：
10.1016/j.ijhydene.2015.12.189
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发表时间：
2016-02
影响因子：
7.2
通讯作者：
K. Iwase;K. Mori;S. Tashiro;Hitoshi Yokota;Tetsuya Suzuki
中科院分区：
文献类型：
--
作者：
K. Iwase;K. Mori;S. Tashiro;Hitoshi Yokota;Tetsuya Suzuki
研究了NdNi_3合金在吸放氢循环过程中的结构变化和P-C等温线。在第一吸收过程中实现的最大氢容量为1.05H/M。在第一次脱附之后，0.75H/M的氢容量保留在合金中。原始合金（R-3 m）的三角晶体结构在第一次吸收中转变为单斜（C2/m）。氢化物相的晶体结构在第一次脱附期间保持单斜。在从合金到单斜氢化物（NdNi 3 H 4.0）的相变过程中，金属亚晶格各向异性地膨胀，a，B和cax分别膨胀8%、7%和44%. Nd 2Ni 4和NdNi 5单电池的体积膨胀了60%以上。NdNi_3 H的相变在第一次吸附-解吸循环中是不可逆的。
The structural change of NdNi3during the hydrogen absorption-desorption cycle and the P–C isotherm have been investigated. The maximum hydrogen capacity achieved in the first absorption process is 1.05 H/M. After the first desorption, 0.75 H/M of hydrogen capacity remains in the alloy. The trigonal crystal structure of the original alloy (R-3m) transforms to monoclinic (C2/m) in the first absorption. The crystal structure of the hydride phase remains monoclinic during the first desorption. The metal sublattice expands anisotropically during phase transformation from the alloy to the monoclinic hydride (NdNi3H4.0);a,b, andcaxes expand by 8%, 7%, and 44%, respectively. The volumes of the unit cell, and the Nd2Ni4and NdNi5cells expand by more than 60%. Phase transformation of NdNi3Hxis irreversible during the first absorption-desorption cycle.