The actinide-platinum binaries Th3Pt4 and U3Pt4: Crystallographic investigation and heavy-fermion behavior of the ferromagnetically ordered U3Pt4

JOURNAL OF ALLOYS AND COMPOUNDS

卷:708

Article

Brisset, Nicolas¹  Chajewski, Grzegorz²  Berche, Alexandre^1,3  Pasturel, Mathieu¹  Pikul, Adam P.²  Tougait, Olivier^1,4 

[1] Univ Rennes 1, UMR CNRS 6226, Inst Sci Chim Rennes, Chim Solide & Mat, Rennes, France

[2] Polish Acad Sci, Inst Low Temp & Struct Res, Ul Okolna 2, PL-50422 Wroclaw, Poland

[3] Univ Montpellier 2, UMR CNRS 5253, Inst Charles Gerhard, Montpellier, France

[4] Univ Lille 1, UMR CNRS 8181, Unite Catalyse & Chim Solide, Villeneuve Dascq, France

关键词: Actinide alloys and compounds;    Crystal structure;    Heat capacity;    Magnetic measurements;   

DOI  :  10.1016/j.jallcom.2017.02.222

来源: Elsevier

【 摘 要 】

The existence of the binary compounds Th3Pt4 and U3Pt4 has been established in the course of the reinvestigation of the U-Pt and Th-Pt systems. Their structural and physical properties have been studied for the first time. Both compounds solidify from the melt of the elemental components with the stoichiometric ratio. Rietveld refinements reveal that they both adopt the trigonal Pu3Pd4 structure type (R (3) over bar space group) with lattice parameters at room temperature of a = 13.6870(3) angstrom, c = 5.7991(2) angstrom for Th3Pt4 and a = 13.2380(2) angstrom, c = 5.6808(2) angstrom for U3Pt4. Magnetic and specific heat measurements show that Th3Pt4 behaves as a typical metal; it was further used as phonon analogue of the U-counterpart. U3Pt4 undergoes a ferromagnetic ordering below T-C = 6.5(5) K. Its low temperature specific heat is dominated by an enhanced Sommerfeld coefficient (246(2) mJ mol(U)(-1) K-2) classifying this phase into the heavy fermion family. (C) 2017 Elsevier B. V. All rights reserved.

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