Abstract High temperature crystal structure of UPt2Si2 determined using single-crystal neutron diffraction at 400 K is reported. It is found that the crystal structure remains of the primitive tetragonal CaBe2Ge2 type with the space group P4/nmm. Anisotropic displacement factors of the Pt atoms at the 2a (3/4 1/4 0) and Si atoms at the 2c (1/4 1/4 z) Wyckoff sites are found to be anomalously large.

中文翻译：

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UPt2Si2的高温四方晶体结构

摘要 报道了在 400 K 下使用单晶中子衍射确定的 UPt2Si2 的高温晶体结构。发现晶体结构仍为原始四方CaBe2Ge2 型，空间群为P4/nmm。发现 2a (3/4 1/4 0) 处的 Pt 原子和 2c (1/4 1/4 z) Wyckoff 位点处的 Si 原子的各向异性位移因子异常大。