High-pressure synthesis of MgNi intermetallic compound and its thermal stability

被引：7

作者：

Kamata, Yasutaka ^{[1
]}

Kataoka, Riki ^{[1
]}

Kyoi, Daisuke ^{[2
]}

Kamegawa, Atsunori ^{[1
]}

Okada, Masuo ^{[1
]}

机构：

[1] Tohoku Univ, Dept Mat Sci, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, IMR, Sendai, Miyagi 9808577, Japan

来源：

MATERIALS TRANSACTIONS | 2008年 / 49卷 / 03期

关键词：

hydrogen storage alloy; high-pressure; magnesium;

D O I：

10.2320/matertrans.MBW200782

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel intermetallic compound of MgNi was synthesized from amorphous MgNi by high pressure technique. Crystal structure, thermal stability and hydrogenation property of the compound were studied. The crystallized MgNi was synthesized at 573 K for 2 h under the pressure of more than 5 GPa, and was found to exhibit a CuTi-type structure with lattice parameters of a = 0.2997(1) nm, c = 0.3166(2) mn. The MgNi was decomposed into Mg2Ni and amorphous phase at 575 K and decomposed into Mg2Ni and MgNi2 over 682 K. Moreover the MgNi was hydrogenated into novel hydride with a CsCl-type structure at 355 K under 2 MPa hydrogen. This novel hydride with a lattice parameter of a = 0.3215(1) nm was decomposed into Mg2Ni and MgNi2 over 428 K under an Ar atmosphere.

引用

页码：457 / 460

页数：4

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