The crystal structures of the ternary intermetallics RE2Pd2Cd (RE = Nd, Sm, Gd, Dy) and RE2Ga2Mg (RE = Tb, Er, Tm, Lu) at 90 K

被引:1
作者
Reimann, Maximilian Kai [1 ]
Koesters, Jutta [1 ]
Bieliauskas, Tautvydas [1 ]
Poettgen, Rainer [1 ]
机构
[1] Univ Munster, Inst Anorgan & Analyt Chem, Corrensstr 30, D-48149 Munster, Germany
来源
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2024年 / 79卷 / 5-6期
关键词
U3Si2; type; intermetallics; superstructure; MAGNETIC-PROPERTIES; GROUND-STATE; CHEMISTRY; U3SI2; SUPERSTRUCTURE; BEHAVIOR; FAMILY;
D O I
10.1515/znb-2024-0014
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structures of the U3Si2-related intermetallic compounds RE2Pd2Cd (RE = Nd, Sm, Gd, Dy) and RE2Ga2Mg (RE = Tb, Er, Tm, Lu) were studied from single crystal X-ray diffraction data at T = 90 K in order to understand the slightly enhanced U-33 displacements of the 2a positions in their room temperature structures. The compounds Sm2Pd2Cd, Gd2Pd2Cd and Dy2Pd2Cd show a decrease of the ratio of U-33 to U-11 for the cadmium atoms, leading to a more isotropic behavior at low temperature, keeping the P4/mbm space group symmetry. Nd2Pd2Cd shows a translationengleiche symmetry reduction to space group P4bm along with a weak puckering effect with shorter (342.7 pm) and longer (345.7 pm) Cd-Nd distances within the Cd@Nd-8 square prisms. This new, non-centrosymmetric superstructure variant was also observed for the magnesium compounds Tb2Ga2.069Mg0.931, Er2Ga2.104Mg0.896, Tm2Ga2.097Mg0.903 and Lu2Ga2.173Mg0.827, which show small degrees of Mg/Ga mixing.
引用
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页码:349 / 355
页数:7
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