کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331863 979020 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, structure and physical properties of GdCu4Al and GdCu4Ga
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis, structure and physical properties of GdCu4Al and GdCu4Ga
چکیده انگلیسی

Two non-stoichiometric Gd compounds, GdCu5−xTrx (Tr=Al, Ga) have been synthesized from the corresponding elements by high temperature reactions in sealed tantalum containers. They crystallize in the hexagonal CaCu5-type (Pearson's symbol hP6, space group P6/mmm, No. 191) with lattice parameters determined from single-crystal X-ray diffraction at room temperature as follows: a=5.0831(10) Å; c=4.156(2) Å for GdCu3.98(4)Al1.02(4), and a=5.1025(10) Å; c=4.155(2) Å for GdCu3.9(1)Ga1.1(1), respectively. Structure refinements from single crystal X-ray diffraction data reveal that substitution of Cu for Al or Ga takes place preferably on one of the two transition metal sites with site symmetry mmm (3g). Both compounds order antiferromagnetically below ∼40 K and ∼36 K, respectively, as determined from temperature dependent dc-magnetization, resistivity and heat-capacity measurements.

Perspective view of the hexagonal structure of GdCu4Al and GdCu4Ga (CaCu5-type), viewed down the c-axis.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 4, April 2006, Pages 1035–1040
نویسندگان
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