کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804137 | 1516479 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of the crystal structure of Mg(AlH4)2 by combined X-ray and neutron diffraction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of the crystal structure of Mg(AlH4)2 by combined X-ray and neutron diffraction Determination of the crystal structure of Mg(AlH4)2 by combined X-ray and neutron diffraction](/preview/png/9804137.png)
چکیده انگلیسی
The structure of magnesium alanate, Mg(AlH4)2, has been examined in detail by combined powder synchrotron X-ray and neutron diffraction. The space group is confirmed to be P3¯m1 with unit cell dimensions of a = 5.2084(3) Ã
and c = 5.8392(5)Â Ã
at 8Â K, a = 5.20309(12)Â Ã
and c = 5.8400(2)Â Ã
at 111Â K and a = 5.1949(2)Â Ã
and c = 5.8537(2)Â Ã
at 295Â K. The structure consists of isolated and slightly distorted AlH4â tetrahedra that are connected via six-coordinated Mg atoms in a distorted octahedral geometry, resulting in a sheet-like structure along the crystallographic c-axis. The distortion of the AlH4â tetrahedra decreases with increasing temperature, whereas, the opposite is the case for the MgH6 octahedra. The Al-H distances are 1.606(10)-1.634(4)Â Ã
, 1.602(10)-1.682(3)Â Ã
and 1.561(12)-1.672(4)Â Ã
at 8, 111 and 295Â K, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 387, Issues 1â2, 25 January 2005, Pages 47-51
Journal: Journal of Alloys and Compounds - Volume 387, Issues 1â2, 25 January 2005, Pages 47-51
نویسندگان
A. Fossdal, H.W. Brinks, M. Fichtner, B.C. Hauback,