Hexagonal ZrNiAl alloy and its hydride (deuteride) with the Fe2P-type structure

被引：16

作者：

Yoshida, M

Akiba, E

Shimojo, Y

Morii, Y

Izumi, F

机构：

[1] NATL INST MAT & CHEM RES,TSUKUBA,IBARAKI 305,JAPAN

[2] JAPAN ATOM ENERGY RES INST,DEPT MAT SCI & ENGN,TOKAI,IBARAKI 31911,JAPAN

[3] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1995年 / 231卷 / 1-2期

关键词：

Fe2P-type structure; X-ray diffraction; neutron diffraction; rietveld refinement; hydrogen;

D O I：

10.1016/0925-8388(95)01713-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

ZrNiAl alloy was found to absorb hydrogen up to a composition of ZrNiAlH0.53 in the measurement of a pressure-composition isotherm at 313 K. The structure parameters of the alloy and its hydride (deuteride) were refined by the Rietveld method using X-ray and neutron diffraction data. Both the alloy and deuteride have the Fe2P-type structure (space group: <P(6)over bar 2m>; a = 6.9152(6) Angstrom and c = 3.4703(4) Angstrom for the alloy; a = 6.7225(7) Angstrom and c = 3.7713(6) Angstrom for the deuteride). Hydrogenation leads to the lattice-contraction of the a axis by 2.8% and the lattice-expansion of the c axis by 8.7%. Neutron Rietveld refinement revealed that deuterium occupies a trigonal-bipyramidal site surrounded by three Zr and two Ni atoms.

引用

页码：755 / 759

页数：5

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