نوع مقاله : مقاله پژوهشی
نویسندگان
پژوهشکده فیزیک و شتابگرها، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، تهران
چکیده
در این مطالعه اثر نقیصه‌های نقطه‌ای بر رسانش حرارتی دی‌اکسید اورانیوم بررسی شده است. به طور خاص اثر اکسیژن بین‌نشین و تهی‌جای مورد توجه بوده است. با حل معادلۀ ترابرد فونون بولتزمن با استفاده از تقریب زمان واهلش، رسانش حرارتی دی‌اکسید اورانیوم برای ابرسلول‌های UO2 ، UO2+0.25 و UO2-0.25 به دست آمده است. ننتایج نشان دادند که افزودن هر نقیصه‌ای در ساختار شبکۀ دی‌اکسید اورانیوم، رسانش حرارتی را به طرز چشمگیری کاهش می‌دهد. همچنین نتایج نشان دادند که تغییرات رسانش حرارتی ابرسلول UO2-0.25 بسیار کمتر از UO2+0.25 در بازۀ دمایی 300 تا 1000 کلوین است.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Calculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equation
نویسندگان [English]
- Samira Sheykhi
- Mahmoud Payami Shabestar
- Mohammad reza Basaadat
Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran, Northen Kargar St., Tehran, Iran
چکیده [English]
In this study, the effect of point defects on the thermal conductivity of UO2 is investigated. Especially, the effects of oxygen vacancy and interstitial are considered. Thermal conductivity of UO2, UO2+0.25 and UO2-0.25 is calculated by solving the phonon Boltzmann equation (BTE) under the relaxation time approximation (RTA). The results show that introducing any defects to the lattice structure of UO2 decreases thermal conductivity significantly. In addition, the results show that the variation of the thermal conductivity of UO2-0.25 is much lower than that of UO2+0.25 in the temperature interval of 300 to 1000 Kelvin.
کلیدواژه‌ها [English]
- uranium dioxide
- phonon Boltzmann equation
- thermal conductivity
- phonon lifetime
- defect
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