کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7967339 | 1514191 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-temperature heat capacity and density of simulated high-level waste glass
ترجمه فارسی عنوان
ظرفیت حرارتی بالا و چگالی شیشه شبیه سازی شده در سطح بالا
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
چکیده انگلیسی
The heat capacities of two simulated high-level waste borosilicate glasses and glass melts have been determined from differential scanning calorimetry and drop-calorimetry measurements between 345Â K and 1673Â K. The densities of the glass melts have been measured by double-bob Archimedean method between 1273Â K and 1573Â K. The volume expansivity between glass transition temperature and 1573Â K has been determined by combining the measured densities and density of supercooled melts below 1273Â K reported previously. Both of the heat capacity and the volume expansivity of the simulated high-level waste glass melts are characterized by a large increase at the glass transition temperature and the rapid decrease with increasing temperature. The configurational contributions to the heat capacity and the volume expansivity at the glass transition temperature are 35% and 88%, respectively. The significant change of the heat capacity is probably attributed to temperature dependence of chemical mixing of boron, aluminum and silicon in the tetrahedral sites, while the change of the volume expansivity is caused by temperature-induced coordination change of boron.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 454, Issues 1â3, November 2014, Pages 298-307
Journal: Journal of Nuclear Materials - Volume 454, Issues 1â3, November 2014, Pages 298-307
نویسندگان
Toru Sugawara, Junki Katsuki, Takashi Shiono, Satoshi Yoshida, Jun Matsuoka, Kazuhiro Minami, Eiji Ochi,