کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440965 | 1398241 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase partitioning and uranium speciation in brannerite-based ceramics
ترجمه فارسی عنوان
پارتیشن بندی فاز و شکل گیری اورانیوم در سرامیک بر اساس برنریت
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
Branneritecontaining ceramics were produced by cold pressing and sintering (CPS) and cold crucible inductive melting (CCIM) methods and examined by X-ray diffraction and absorption and by scanning electron microscopy. Brannerite content in the ceramics ranged between â¼20 and 90 vol.%. Uranium is mainly partitioned between brannerite and minor mixed U/RE oxide but since brannerite is a dominant phase, it takes up to 90% of total U. Uranium in the ceramics is present as U(IV) and U(V). In the low-brannerite ceramics U occurs as U(IV) whereas in the ceramics with brannerite as major phase U(V) dominates over U(IV). Ce in the brannerite ceramics is mainly trivalent. The first coordination shell of U in ceramics produced by CPS is split into two sub-shells with U-O distances of 1.7-1.9Â Ã
and â¼2.1Â Ã
while in the melted ceramics this interatomic distance is 2.1-2.2Â Ã
. The next three atoms (Ti) are positioned at a distances of 3.1-3.2Â Ã
.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 2, February 2017, Pages 771-777
Journal: Journal of the European Ceramic Society - Volume 37, Issue 2, February 2017, Pages 771-777
نویسندگان
S.V. Stefanovsky, S.V. Yudintsev, A.A. Shiryaev, V.Y. Murzin, A.L. Trigub,