Phase equilibria in the Tb-Mg-Co system at 500 °C, crystal structure and hydrogenation properties of selected compounds

被引：23

作者：

Shtender, V. V. ^{[1
]}

Denys, R. V. ^{[2
]}

Zavaliy, I. Yu. ^{[1
]}

Zelinska, O. Ya. ^{[3
]}

Paul-Boncour, V. ^{[4
,5
]}

Pavlyuk, V. V. ^{[3
]}

机构：

[1] NAS Ukraine, Karpenko Phys Mech Inst, UA-79601 Lvov, Ukraine

[2] Hystorsys AS, NO-2027 Kjeller, Norway

[3] Ivan Franko Natl Univ Lviv, Dept Inorgan Chem, UA-79005 Lvov, Ukraine

[4] CNRS, CMTR, Inst Chim & Mat Paris Est, F-94320 Thiais, France

[5] U PEC, F-94320 Thiais, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2015年 / 232卷

关键词：

Rare earth compounds; Magnesium compounds; Isothermal section; Crystal structure; Hydrogen storage; Metal hydrides; K ISOTHERMAL SECTIONS; ABSORPTION-DESORPTION; TERNARY-SYSTEM; MAGNESIUM COMPOUNDS; STORAGE PROPERTIES; PR; NI; ND; LA; DIAGRAM;

D O I：

10.1016/j.jssc.2015.09.031

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The isothermal section of the Tb-Mg-Co phase diagram at 500 degrees C has been built on the basis of XRD analysis of forty samples prepared by powder metallurgy. The existence of two ternary compounds Tb4Mg3Co2 and Tb4MgCo was confirmed. The formation of two solid solutions, Tb1-xMgxCo3 (0 <= x <= 0.4) and Tb1--xMgxCo2 (0 <= x <= 0.6), was found for the first time. It is shown that Tb5Mg24 also dissolves a small amount of Co. Other binary compounds do not dissolve the third component. The Tb4MgCo and TbMgCo4 compounds form hydrides (12.7 and 5.3 atH/f.u. capacity, respectively) that retain the original structure of metallic matrices. Upon thermal desorption the Tb4MgCoH12.7 hydride was stable up to 300 C and disproportionated at higher temperature. Two other hydrides, Tb4Mg3Co2H similar to 4 and Tb2MgCo9H12, are unstable in air and decompose into the initial compounds. (C) 2015 Elsevier Inc. All rights reserved.

引用

页码：228 / 235

页数：8

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