کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1330217 | 978944 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Extension of the La7Mo7O30 structural type with La7Nb3W4O30 and La7Ta3W4O30 compounds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی معدنی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Extension of the La7Mo7O30 structural type with La7Nb3W4O30 and La7Ta3W4O30 compounds Extension of the La7Mo7O30 structural type with La7Nb3W4O30 and La7Ta3W4O30 compounds](/preview/png/1330217.png)
چکیده انگلیسی
Two compounds of formula La7A3W4O30 (with A=Nb and Ta) were prepared by solid-state reaction at 1450 and 1490 °C. They crystallize in the rhombohedric space group R -3 (No. 148), with the hexagonal parameters: a=17.0640(2)Å, c=6.8859(1)Å and a=17.0701(2)Å, c=6.8851(1)Å. The structure of the materials was analyzed from X-ray, neutron and electronic diffraction. These oxides are isostructural of the reduced molybdenum compound La7Mo7O30, which are formed of perovskite rod along [111]. An order between (Nb, Ta) and W is observed.
Projection of the perovskite structure and La7A3W4O30 structure along [111] and [001], respectively.Figure optionsDownload as PowerPoint slide
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 178, Issue 9, September 2005, Pages 2811–2817
Journal: Journal of Solid State Chemistry - Volume 178, Issue 9, September 2005, Pages 2811–2817
نویسندگان
F. Goutenoire, S. Kodjikian, E. Suard,