Crystal structure and magnetic properties of GdSi1.78, Gd(Si0.684Ge0.316)1.78, GdGe1.57, and GdSn2 compounds

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:385

Article

Zou, J. D.^1,2  Liu, J.^2,3  Yan, M.¹ 

[1] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Key Lab Novel Mat Informat Technol Zhejiang Prov, Hangzhou 310027, Zhejiang, Peoples R China

[2] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

关键词: Rare earth intermetallics;    Magnetic properties;    Phase transition;    Antiferromagnetism;    Heat capacity;   

DOI  :  10.1016/j.jmmm.2015.02.057

来源: Elsevier

【 摘 要 】

Intermetallic compounds of Gd with Si, Ge, and Sri near 1:2 stoichiometry adopt several closely related crystal structures. We find that GdSi1.78 and Gd(Si0.684Ge0.316)(1.78) crystallize in the same GdSi1.4-type orthorhombic structure (space group forma), while GdGe1.57 and GdSn2 adopt alpha-ThSi2-type tetragonal structure (space group I4(1)/amd) and ZrSi2-type orthorhombic structure (space group Cmcm), respectively. All compounds order antiferromagnetically; their Neel temperatures are only weakly affected by the magnetic field of less than 50 kOe. Unusual features are observed including multiple phase transitions and thermomagnetic irreversibilities. (C) 2015 Elsevier B.V. All rights reserved.

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