کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333519 979082 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective substitution of vanadium for molybdenum in Sr2(Fe1−xVx)MoO6 double perovskites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Selective substitution of vanadium for molybdenum in Sr2(Fe1−xVx)MoO6 double perovskites
چکیده انگلیسی

The crystal and magnetic structures of Sr2(Fe1−xVx)MoO6 (0.03⩽x⩽0.1) compounds are refined by alternately using X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) data collected at room temperature. The refinement results reveal that the V atoms selectively occupy the Mo sites instead of the Fe sites for x⩽0.1. The 3d/4d cation ordering decreases with the increase of the V content. Slight distortions in the lattice and metal octahedra are shown at 300 K, and the distortions increase at 4 K. The magnetic structure at 4 K can be modeled equally well with the moments aligning along [001], [110] or [111] directions. The total moments derived from the NPD data for the [110] and [111] direction models agree well with the magnetic measurements, whereas the [001] model leads to a smaller total moment. Bond valence analysis indicates that Sr ions are properly located in the structure and Mo ions are compatible with both the Fe sites and the Mo sites. The electronic effects are suggested to be responsible for the selective occupation of the V on the Mo sites due to the different distortions of the FeO6 and MoO6 octahedra.

Magnetic structure models with the moments aligning along [110], [100] and [111] directions, respectively, for Sr2(Fe1−xVx)MoO6 compounds.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 8, August 2006, Pages 2458–2465
نویسندگان
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