New ternary intermetallics RE5Ru3Al2 (RE = La, Ce, Pr): Synthesis, crystal structures, magnetic and electric properties

被引：24

作者：

Murashova, E. V. ^{[1
]}

Tursina, A. I. ^{[1
]}

Bukhanko, N. G. ^{[1
]}

Nesterenko, S. N. ^{[1
]}

Kurenbaeva, Zh. M. ^{[1
]}

Seropegin, Y. D. ^{[1
]}

Noel, H. ^{[2
]}

Potel, M. ^{[2
]}

Roisnel, T. ^{[2
]}

Kaczorowski, D. ^{[3
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

[2] Univ Rennes 1, CNRS, UMR 6226, F-35042 Rennes, France

[3] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

来源：

MATERIALS RESEARCH BULLETIN | 2010年 / 45卷 / 08期

关键词：

Intermetallic compounds; X-ray diffraction; Crystal structure; Magnetic properties; Electrical properties; COMPOUND; INDIDES; TM;

D O I：

10.1016/j.materresbull.2010.04.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Intermetallics RE5Ru3Al2 (RE = La, Ce, Pr) were prepared by arc melting of the elemental components with subsequent annealing at 820 K. The crystal structures were determined from single-crystal (Ce5Ru3Al2, Pr5Ru3Al2) and powder (La5Ru3Al2) X-ray diffraction at room temperature. The compounds belong to new structural types: space group R3, Z = 6, a = 13.9270(3) angstrom, c = 8.3260(2) angstrom for Ce5Ru3Al2 and space group I2(1)3, Z = 4, a = 9.95419(6) angstrom and 9.8084(3) angstrom for La5Ru3Al2 and Pr5Ru3Al2, respectively. The trigonal structure of Ce5Ru3Al2 is a distorted variant of the cubic La5Ru3Al2 and Pr5Ru3Al2 structures. An interesting feature of the Ce5Ru3Al2 are the short (2.5299(16) angstrom and 2.5969(15) angstrom) Ce-Ru distances. Magnetic measurements revealed the Pauli paramagnetic behavior in La5Ru3Al2 and the Curie-Weiss paramagnetism in Pr5Ru3Al2. The latter compound likely exhibits a kind of magnetically ordered state below 24 K. In turn, Ce5Ru3Al2 remains paramagnetic down to 4.2 K and shows signs of mixed valence states of Ce ions. Electrical resistivity measurements indicated simple metallic conductivity in La5Ru3Al2 and Pr5Ru3Al2, and a more complex metallic behavior in Ce5Ru3Al2. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：993 / 999

页数：7

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