Crystal structures and magnetic properties of NdCoAl4, Nd2Co3Al9 and SM2Co3Al9

被引：11

作者：

Tougait, O ^{[1
]}

Noël, H ^{[1
]}

机构：

[1] Univ Rennes 1, CNRS, Chim Solide & Inorgan Mol Lab, UMR 6511, F-35042 Rennes, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 417卷 / 1-2期

关键词：

single-crystal X-ray diffraction; magnetic susceptibility; rare-earth intermetallics; ternary phase diagram;

D O I：

10.1016/j.jallcom.2005.08.062

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：

The new compounds, NdCoAl4, Nd2Co3Al9 and Sm2Co3Al9 have been prepared by arc-melting of the elemental components. The chemical and structural characterizations were carried out on both as-cast and annealed samples using X-ray diffractometry, metallographic analysis and EDS-microanalysis. The crystal structures of NdCoAl4 and Nd2Co3Al9 were refined from the single-crystal X-ray diffraction data, collected at room temperature. NdCoAl4 adopts the LaCoAl4 type of structure, crystallizing with the orthorhombic space group Pmma (no. 51), in a unit cell of dimensions: a=7.6574(3) angstrom, b=4.0401(1) angstrom, c=6.8499(3) angstrom. Nd2CO3Al9 crystallizes in the orthorhombic space group Cmcm (n degrees 63), with the lattice parameters: a=12.8911(4) angstrom, b=7.5594(2) angstrom, c=9.4703(2) angstrom. Nd2CO3Al9 and Sm2Co3Al9 are isostructural to the (Y2CoGa9)-Ga-3-type. Magnetic susceptibility measurements, recorded in the temperature range 1.7-300 K, have revealed that all phases orders antiferromagnetically at low temperature. The Neel temperature are 2.8, 3.0 and 6 K for NdCoAl4, Nd2Co3Al9 and Sm2Co3Al9, respectively. At high temperature, the paramagnetic domain is dominated by the contribution of the rare-earth ions. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1 / 6

页数：6

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