کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9793754 1514278 2005 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Melting of stoichiometric and hyperstoichiometric uranium dioxide
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Melting of stoichiometric and hyperstoichiometric uranium dioxide
چکیده انگلیسی
The solid-liquid transition in stoichiometric and hyperstoichiometric UO2 was investigated by means of advanced techniques. Laser heating enabling fast melting and freezing processes was used under container-less conditions and buffer gas pressures up to 250 MPa, making non-congruent evaporation ineffective. Pulse thermograms of UO2+x with 0 ⩽ x ⩽ 0.21 were recorded with fast pyrometers and interpreted with computer simulations. In addition, a novel method for identification of phase transitions was implemented, based on the detection of surface reflectivity variations. The melting line of UO2.00 was for the first time determined at pressures between 10 and 250 MPa, and the melting temperature of the stoichiometric oxide was measured to be 3147 ± 20 K, in fair agreement to previous measurements reported in the literature. The liquidus and solidus lines of UO2+x differ from the currently recommended data, which substantially underrate the effect of oxygen on melting.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 342, Issues 1–3, 30 June 2005, Pages 148-163
نویسندگان
, , , , ,