کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9793633 | 1514276 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Four thallium(I) uranates(VI), their preparation, structure and properties
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Four thallium(I) uranates(VI), Tl4UO5, Tl2UO4, Tl2U2O7 and Tl2U3O10, were prepared and their IR, and, for the first time, their Raman, electronic and X-ray absorption (EXAFS) spectra have been measured. These uranates are thermally stable under nitrogen up to 660 °C but above this temperature they decompose and their uranium content increases, due to loss of Tl2O. The thermal stability of these uranates increases with decreasing thallium content. Comparison with the reported values for the standard enthalpies of formation of the corresponding alkali metal uranates, which are essentially cation independent, allows suggested values for the above uranates, respectively, of â2437, â1900, â3182, and â4437 kJ molâ1. Structural information and atom arrangements were obtained from analysis of powder XRD and EXAFS spectroscopy measurements. U-O distances, both primary and secondary, were obtained from EXAFS measurements and these were essentially identical with those calculated from vibrational IR spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 344, Issues 1â3, 1 September 2005, Pages 73-78
Journal: Journal of Nuclear Materials - Volume 344, Issues 1â3, 1 September 2005, Pages 73-78
نویسندگان
Vladimir A. Volkovich, Iain May, Trevor R. Griffiths, John M. Charnock, Bob Lewin,