U₃Pt₁₂Si₄: Structural and Physical Properties of a New Uranium-Platinum-Silicon Ternary Compound

Abstract:

A novel ternary compound, namely U₃Pt₁₂Si_4, which is best described by the crystallographic formula U₃Pt_12+x-ySi_4-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 EuMg_5.2 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 μ_eff = 3.18 μ_B. Its low temperature specific heat is moderately enhanced (its Sommerfeld coefficient γ is equal to 79(1) mJ mol_U^-1 K^-2) and the electrical resistivity exhibits some characteristic features of dense Kondo lattices.

• Periodical: Solid State Phenomena (Volume 257)
• Pages: 86-91
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.257.86
• Online since: October 2016
• Authors: Nicolas Brisset, Grzegorz Chajewski, Adam Pikul, Olivier Tougait, Mathieu Pasturel*
• Keywords: Gd₃Ru₄Al₁₂, Paramagnetism, Silicide, Uranium

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