کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1329265 978899 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deuterium ordering in Laves-phase deuteride YFe2D4.2
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Deuterium ordering in Laves-phase deuteride YFe2D4.2
چکیده انگلیسی

The structure of Laves-phase deuteride YFe2D4.2 has been investigated by synchrotron and neutron (ToF) powder diffraction experiments between 60 and 370 K. Below 323 K, YFe2D4.2 crystallizes in a fully ordered, monoclinic structure (s.g. Pc, Z=8, a=5.50663(4), b=11.4823(1), c=9.42919(6) Å, β=122.3314(5)°, V=503.765(3) Å3 at 290 K) containing 4 yttrium, 8 iron and 18 deuterium atoms. Most D–D distances are, within the precision of the diffraction experiment, longer than 2.1 Å; the shortest ones are of 1.96 Å. Seven of eight iron atoms are coordinated by deuterium in a trigonal bipyramid, similar to that in TiFeD1.95−2. The eighth iron atom is coordinated by deuterium in a tetrahedral configuration. The coordination of iron by deuterium, and the iron-deuterium distances point to the importance of the directional bonding between iron and deuterium atoms. The lowering of crystal symmetry due to deuterium ordering occurs at much higher temperature than the magnetic ordering, and is therefore one of the parameters that are at the origin of the magnetic transition at lower temperatures.

Laves-phase deuteride YFe2D4.2 crystallizes below 323 K in fully ordered monoclinic structure. Seven iron atoms from eight are coordinated by deuterium in a trigonal bipyramid, similar to that in TiFeD1.95−2. The eights iron atom is coordinated by deuterium in a tetrahedral configuration.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 182, Issue 7, July 2009, Pages 1907–1912
نویسندگان
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