Crystal chemistry and magnetic properties of ternary compounds REAg_x

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• 作者：R. Gumeniuk ; Yu. Prots ; W. Schnelle ; U. Burkhardt ; Yu. Kuz’ ; ma ; Yu. Grin
• 关键词：Intermetallic compound ; Crystal structure ; X-ray diffraction ; Magnetic susceptibility
• 刊名：Journal of Alloys and Compounds
• 出版年：2009
• 出版时间：5 February 2009
• 年：2009
• 卷：469
• 期：1-2
• 页码：28-33
• 全文大小：632 K

文摘

The crystal structure of LuAg_1.2Ga_1.8 was determined from single-crystal X-ray diffraction data (structure type β-YbAgGa₂, space group Pnma, a = 6.8821(4) Å, b = 4.2695(2) Å, c = 10.1268(5) Å, R_F = 0.029, R_W = 0.031 for 595 unique reflections and 28 variables). Applying X-ray powder diffraction, the new compounds REAg_xGa_3−x (RE = Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) were found to be isostructural. They possess homogeneity ranges at 873 K with x values between 1.04 and 1.35. From magnetic susceptibility data the compounds REAg_xGa_3−x (RE = Sm, Gd, Tb, Dy, Ho, Er, Tm) are paramagnets and order antiferromagnetically at low temperatures, while LuAg_xGa_3−x is a diamagnet.