کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1332122 979030 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and magnetism of NaRu2O4 and Na2.7Ru4O9
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Structure and magnetism of NaRu2O4 and Na2.7Ru4O9
چکیده انگلیسی

The structures of NaRu2O4 and Na2.7Ru4O9 are refined using neutron diffraction. NaRu2O4 is a stoichiometric compound consisting of double chains of edge sharing RuO6 octahedra. Na2.7Ru4O9 is a non-stoichiometric compound with partial occupancy of the Na sublattice. The structure is a mixture of single, double and triple chains of edge-shared RuO6 octahedra. NaRu2O4 displays temperature independent paramagnetism with χ0=1.23×10-4emu/molRuOe. Na2.7Ru4O9 is paramagnetic, χ0χ0=2.0×10-4emu/molOe with Θw=-11.8K and a Curie constant of 0.0119 emu/mol Oe K. Specific heat measurements reveal a small upturn at low temperatures, similar to the upturn observed in La4Ru6O19. The electronic contribution to the specific heat (γ) for Na2.7Ru4O9 was determined to be15 mJ/moleRu K2.

Magnetic susceptibility versus temperature data for NaRu2O4 (closed squares) and Na2.7Ru4O9 (open triangles). χ0=1.2×10-4emu/molRuOe for NaRu2O4, χ0=2.0×10-4emu/molRuOe for Na2.7Ru4O9. Inset: Inverse magnetic susceptibility vs. temperature data for Na2.7Ru4O9. A linear fit of the high temperature data from 125 to 200 K shows Curie–Weiss behavior, giving Θcw=-11.8K and C=0.0119emu/molOeK.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 1, January 2006, Pages 195–204
نویسندگان
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