Ternary antimonides Ln2Pd9Sb3 (Ln = La, Ce, Nd, Pr, and Sm): Crystal, electronic structure, and magnetic properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:815

Article

Zhak, O.¹  Zdorov, T.¹  Levytskyy, V¹  Babizhetskyy, V¹  Zheng, C.²  Isnard, O.^3,4 

[1] Ivan Franko Natl Univ Lviv, Fac Chem, Kyryla & Mefodiya Str 6, UA-79005 Lvov, Ukraine

[2] Northern Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA

[3] Univ Grenoble Alpes, Inst Neel, 25 Rue Martyrs,BP 166, Grenoble 9, France

[4] CNRS, 25 Rue Martyrs,BP 166, Grenoble 9, France

关键词: Rare-earth intermetallics;    Crystal structure;    X-ray diffraction;    Electronic structure;    Magnetic properties;   

DOI  :  10.1016/j.jallcom.2019.152428

来源: Elsevier

【 摘 要 】

A series of new ternary antimonides Ln(2)Pd(9)Sb(3) (Ln = La, Pr, Nd, Sm) was synthesized from pure constituents. The crystal structure of all compounds was determined by X-ray powder diffraction. These compounds are isotypic with the Ce2Pd9Sb3 structure (anti-type to the ternary gallide Y2Co3Ga9, space group Cmcm): a = 13.7772 (6), b = 8.0642 (3), c = 9.3967 (4) angstrom for La2Pd9Sb3; a = 13.7392 (6), b = 8.0146 (3), c = 9.3215 (4) angstrom for Pr2Pd9Sb3; a = 13.7208 (5), b = 7.9983 (3), = 9.3016 (3) angstrom for Nd2Pd9Sb3; a = 13.6957 (7), b = 7.9686 (4), c = 9.2700 (5) angstrom for Sm2Pd9Sb3. The electronic structures of Ln(2)Pd(9)Sb(3) were analyzed using the tight-binding extended Hfickel method on cerium representative. The analysis of the magnetic properties shows that the Ln(2)Pd(9)Sb(3) (Ln = La, Nd, Pr, and Sm) compounds are paramagnetic down to a very low temperature. Curie-Weiss paramagnetic temperature are small and range from between -6 and -1 K. The Sm and Pr containing phases exhibits the largest ordering temperature of 6.8 and 6.2 K, respectively. The Ce containing phase also orders magnetically below 4 K in contrast to the La one (which remains paramagnetic even at 2 K), thus indicating that Ce is carrying an ordered magnetic moment. At 2 K, the magnetization curves of these compounds do not saturate easily even in applied fields up of 10 T. (C) 2019 Elsevier B.V. All rights reserved.

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