Crystal structure and some magnetic properties of novel compounds: U 3Pt23Si11, U3Pt5Si and U6Pt30Si19

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作者：
Chotard, J.N. [1 ,4 ]
Tougait, O. [1 ]
Noël, H. [1 ]
Rogl, P. [2 ]
Zelinskiy, A. [3 ]
Bodak, O.I. [3 ]
机构：
[1] Laboratoire de Chimie du Solide et Inorganique Moléculaire, UMR 6511 CNRS, Institut de Chimie, Ave. du Gén. Leclerc, 35042 Rennes, France
[2] Institut für Physikalische Chemie, Universität Wien, Währingerstrasse 42, A-1090 Wien, Austria
[3] Ivan Franko L'viv National University, Inorganic Department, Kyryla and Mefodia Street 6, L'viv, 79005, Ukraine
[4] Université de Genève, Laboratoire de Cristallographie, 24, quai Ernest-Ansermet, CH-1211 Geneve 4, Switzerland
来源：
Journal of Alloys and Compounds | 2006年 / 407卷 / 1-2期
关键词：
Three new compounds have been found in the U-Pt-Si ternary system; U; 3Pt23Si11; U3Pt5Si and U6Pt30Si19. They were prepared by reaction of the elemental components in an arc-melting furnace followed by heat-treatment at 900 °C for several days. Their chemical composition was checked by scanning electron microscopy and by energy dispersive spectroscopy. Their crystal structure was determined by single crystal X-ray diffraction techniques. The compound U3Pt23Si11; formerly reported as U2Pt15Si7; crystallizes in the cubic space group Fm3¯m; with a unit-cell parameter at room temperature; a = 16.8341(3) Å. The most striking feature of the structure is the occurrence of octahedral clusters of uranium with short U-U bonds of 3.004(2) Å. U 3Pt5Si crystallizes in the orthorhombic space group Imma; in a cell of dimension at room temperature a = 7.1733(3) Å; b = 12.9671(6) Å and c = 7.3578(3) Å. Its crystal structure is closely related to that of Ce3Pd5Si; from which it only differs by a partial disorder of one Pt-atom site. The dc-magnetic measurement revealed that U 3Pt5Si orders antiferromagnetically at TN = 11(1) K. U6Pt30Si19 crystallizes in the hexagonal space group P63/m; in a cell of dimension at room temperature a = 15.9377(2) Å and c = 3.9874(1) Å. It belongs to a large family of ternary alloys obeying the general formula; Rn(n+1)T6(n2+1); M4n2+3; where R stands for f-metal; T for d-transition metal and M for the main-group element. © 2005 Elsevier B.V. All rights reserved;
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页码：36 / 43
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