Effect of Mg substitution on crystalline structure and hydrogenation of Gd4MgNi19
Effect of Mg substitution on crystalline structure and hydrogenation of Gd4MgNi19
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Mg取代对Gd4MgNi19晶体结构和氢化的影响
DOI：
10.1016/j.ijhydene.2017.11.166
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Tetsuya Suzuki
中科院分区：
文献类型：
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作者：
Kenji Iwase;Kazuhiro Mori;Naoyoshi Terashita;Suguru Tashiro;Tetsuya Suzuki
利用X射线衍射（XRD）和压力-成分（P-C）等温线研究了Mg替代对Gd 4 MgNi 19合金的影响。Gd 4 MgNi 19由56%Gd2Co7型、27%Ce5Co19型和17%CaCu5型结构组成，这些结构保留在氢化物相中。在氢化物相的XRD曲线中观察到峰加宽，而在P-C等温线测量后，在氢解吸的合金中峰加宽的程度减小。可逆氢容量达到1.0H/M。在0.10 ~ 0.80 H/M之间存在一个宽的平台区，Gd 5 Ni 19由89%Sm5Co19型和11%CaCu5型结构组成。在P-C等温线测量之后，氢解吸的Gd 5 Ni 19合金在XRD曲线中显示出严重的−峰加宽。P-C等温线上存在一个倾斜的平台，Mg取代降低了P-C等温线上严重的峰宽化和晶格应变，提高了加氢性能。
The effect of Mg substitution on Gd4MgNi19was investigated using X-ray diffraction (XRD) and pressure-composition (P-C) isotherm measurements. Gd4MgNi19consists of 56% Gd2Co7-type, 27% Ce5Co19-type, and 17% CaCu5-type structures, which are retained in the hydride phase. Peak broadening was observed in the XRD profile of the hydride phase, while the degree of peak broadening decreased in the hydrogen-desorbed alloy after the P-C isotherm measurement. The reversible hydrogen capacity reached 1.0 H/M. There was a wide plateau region between 0.10 H/M and 0.80 H/M during the absorption-desorption process.Gd5Ni19consists of 89% Sm5Co19-type and 11% CaCu5-type structures. After the P-C isotherm measurement, the hydrogen-desorbed Gd5Ni19alloy showed severe −peak broadening in the XRD profile. The reversible hydrogen capacity was 0.80 H/M, and there was a sloping plateau in the P-C isotherm.Mg substitution decreases the severe peak broadening and lattice strain after the P-C isotherm measurement, and enhances the hydrogenation property.