Crystal structure and hydrogen of La-Mg-Ni-Co alloy with storage properties superstructure

被引：51

作者：

Chai, Y. J.

Sakaki, K.

Asano, K.

Enoki, H.

Akiba, E.

Kohno, T.

机构：

[1] Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba, Ibaraki 3058565, Japan

[2] Toshiba Co Ltd, Ctr Corp Res & Dev, Saiwai Ku, Kawasaki, Kanagawa 2128582, Japan

来源：

SCRIPTA MATERIALIA | 2007年 / 57卷 / 06期

关键词：

crystal structure; hydrogen storage materials; pressure-composition isotherms;

D O I：

10.1016/j.scriptamat.2007.05.018

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The crystal structure and hydrogen storage properties of the alloys La0.67Mg0.33Ni2.5Co0.5, La0.7Mg0.3Ni2.8Co0.5 and La0.75Mg0.25Ni3.0Co0.05 were investigated. X-ray diffraction results suggested that all the three samples were mainly composed of PuNi3-type, Ce2N7-type and Pr5Co19-type phase. These alloys reversibly absorbed and desorbed hydrogen up to similar to 1.0 H/M under a hydrogen pressure of 2.5 MPa at 333 K. Moreover, the hexagonal structure of Ce2Ni7-type and Pr5Co19-type was retained during the absorption-desorption process. After hydrogenation, a volumetric expansion of 22.7% was observed for Ce2Ni7-type phase, and an expansion of 1.3% still remained after dehydrogenation. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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页码：545 / 548

页数：4

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