Crystal structure and properties of U2Co3Al9

被引：7
作者：
Troc, R.
Tougait, O.
Noel, H.
机构：
[1] Polish Acad Sci, W Trzebiatowski Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland
[2] Univ Rennes 1, Chim Solide & Inorgan Mol Lab, CNRS, UMR6511, F-30542 Rennes, France
来源：
INTERMETALLICS | 2007年 / 15卷 / 08期
关键词：
intermetallics; miscellaneous; crystal chemistry of intermetallics; electrical resistance and other electrical properties; magnetic properties;
D O I：
10.1016/j.intermet.2007.01.003
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：
A new ternary compound with stoichiornetry U2CO3Al9 has been synthesized. It adopts the orthorhombic Y2CO3Ga9-type structure (space group Cmcm, Z = 4, a = 12.824(2) angstrom, h = 7.515(l) angstrom, c = 9.249(2) angstrom. Measurements of dc- and ac-magnetic susceptibility, electrical resistivity, and magnetoresistivity on polycrystalline samples have been performed. The Curie-Weiss law is strictly followed, with theta(CW) = -48 K and mu(eff) = 3.2 mu(B). A small kink observed in the temperature dependence of the resistivity is attributed to a phase transition at T-t = 8 K. The magnetoresistivity was found to be negative at all temperatures examined below 45 K, with a sharp minimum at T-t = 8 K. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1091 / 1095
页数：5
相关论文
共 14 条
[1]   Crystallographic and physical properties of new ternary R2T3X9 (R = La, Ce, U, T = Rh, Ir, X = Al, Ga) compounds [J].
Buschinger, B ;
Geibel, C ;
Weiden, M ;
Dietrich, C ;
Cordier, G ;
Olesch, G ;
Kohler, J ;
Steglich, F .
JOURNAL OF ALLOYS AND COMPOUNDS, 1997, 260 (1-2) :44-49
[2]   Y2CO3AL9 WITH Y2CO3GA9 TYPE-STRUCTURE - AN INTERGROWTH OF CSCL- AND TH3PD5-TYPE SLABS [J].
GLADYSHEVSKII, RE ;
CENZUAL, K ;
PARTHE, E .
JOURNAL OF ALLOYS AND COMPOUNDS, 1992, 182 (01) :165-170
[3]  
Grin' Yu. N., 1984, Soviet Physics - Crystallography, V29, P528
[4]   Magnetism in R2T3X9 (R = Ce, Yb, U; T = Rh, Ir; X = Al, Ga) intermetallic compounds [J].
Hiess, A ;
Coad, S ;
Buschinger, B ;
Trovarelli, O ;
Boucherle, JX ;
Givord, F ;
Hansen, T ;
Lelievre-Berna, E ;
Suard, E ;
Geibel, C ;
Steglich, F .
PHYSICA B-CONDENSED MATTER, 1999, 259-61 :343-344
[5]   Preparation and crystal structure of ternary rare-earth platinum metal aluminides R2T3Al9 (T= Rh, Ir, Pd) with Y2Co3Ga9-type structure and magnetic properties of the iridium compounds [J].
Niermann, J ;
Fehrmann, B ;
Wolff, MW ;
Jeitschko, W .
JOURNAL OF SOLID STATE CHEMISTRY, 2004, 177 (07) :2600-2609
[6]   The U-Co-Al ternary system: Phases formation and isothermal section of the phase diagram at 900 °C [J].
Noël, H ;
Tougait, O ;
Troc, R ;
Zaremba, V .
SOLID STATE SCIENCES, 2005, 7 (06) :780-783
[7]   Magnetoresistivity of R2Rh3Al9 (R = Ce, La) and A2Rh3Ga9 (A = U, Th) [J].
Strydom, AM .
SOLID STATE COMMUNICATIONS, 2002, 123 (08) :343-348
[8]   Crystal structures and magnetic properties of NdCoAl4, Nd2Co3Al9 and SM2Co3Al9 [J].
Tougait, O ;
Noël, H .
JOURNAL OF ALLOYS AND COMPOUNDS, 2006, 417 (1-2) :1-6
[9]   Spin-glass like behavior in a new ternary uranium cobalt alummide, U3CO4+xAl12-x with x=0.55(2) [J].
Tougait, O ;
Noël, H ;
Troc, R .
JOURNAL OF SOLID STATE CHEMISTRY, 2004, 177 (06) :2053-2057
[10]   Synthesis, crystal structure and magnetic properties Of U2Co6Al19 [J].
Tougait, O ;
Stêpien-Damm, J ;
Zaremba, V ;
Noël, H ;
Troc, R .
JOURNAL OF SOLID STATE CHEMISTRY, 2003, 174 (01) :152-158
12