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U3Pt12Si4: Structural and physical properties of a new uranium-platinum-silicon ternary compound

Abstract : A novel ternary compound, namely U3Pt12Si4, which is best described by the crystallographic formula U3Pt12+x-ySi4-x-z (x = 0.15, y = 0.23, z = 0.16), has been discovered in the U-Pt-Si phase diagram. It crystallizes in a hexagonal unit cell (P63/mmc space group) with a = 8.7267(1) Å and c = 9.3385(2) Å. Its structure is an ordered variant of the EuMg5.2 type with partial occupancies of the Si 4e and Pt 2b positions and mixed Si/Pt occupancy of the 6g site. Magnetic properties measurements revealed that the compound is a Curie-Weiss paramagnet with an effective magnetic moment μeff = 3.18 μB. Its low temperature specific heat is moderately enhanced (its Sommerfeld coefficient γ is equal to 79(1) mJ molU- 1 K-2) and the electrical resistivity exhibits some characteristic features of dense Kondo lattices. © 2017 Trans Tech Publications, Switzerland.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01515145
Contributor : Laurent Jonchère <>
Submitted on : Thursday, April 27, 2017 - 9:45:54 AM
Last modification on : Saturday, October 17, 2020 - 3:09:23 AM

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N. Brisset, G. Chajewski, A. Pikul, O. Tougait, M. Pasturel. U3Pt12Si4: Structural and physical properties of a new uranium-platinum-silicon ternary compound. 20th International Conference on Solid Compounds of Transition Elements, SCTE2016, Apr 2016, Zaragoza, Spain. pp.86--91, ⟨10.4028/www.scientific.net/SSP.257.86⟩. ⟨hal-01515145⟩

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