Abstract
A series of rare-earth metal–magnesium–germanides RE 2MgGe 2 ( RE=Y, Nd, Sm, Gd–Tm, Lu) has been synthesized by reactions of the corresponding elements at high temperature. Their structures have been established by single-crystal and powder X-ray diffraction and belong to the Mo 2FeB 2 structure type (space group P4 /mbm (No. 127), Z=2; Pearson symbol tP10). Temperature dependent DC magnetization measurements indicate Curie–Weiss paramagnetism in the high-temperature regime for all members of the family, excluding Y 2MgGe 2, Sm 2MgGe 2, and Lu 2MgGe 2. At cryogenic temperatures (ca. 60 K and below), most RE 2MgGe 2 phases enter into an antiferromagnetic ground-state, except for Er 2MgGe 2 and Tm 2MgGe 2, which do not undergo magnetic ordering down to 5 K. The structural variations as a function of the decreasing size of the rare-earth metals, following the lanthanide contraction, and the changes in the magnetic properties across the series are discussed as well.
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