Результаты исследований: Вклад в журнал › Статья › Рецензирование
Результаты исследований: Вклад в журнал › Статья › Рецензирование
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TY - JOUR
T1 - Oxygen diffusion in uranium dioxide in the temperature range of phase transitions
AU - Kupryazhkin, A. ya.
AU - Zhiganov, A. n.
AU - Risovanyi, D. v.
AU - Risovanyi, V. d.
AU - Golovanov, V. n.
PY - 2004/2/1
Y1 - 2004/2/1
N2 - The structure of and oxygen diffusion in UO2 are studied by the molecular dynamics method in the range of transition to the superionic state (melting of the oxygen sublattice) and near the melting point of UO 2. The temperature dependence of the diffusion coefficient of a doubly charged oxygen ion in UO2 is constructed. In the crystalline state at temperatures between 1800 and 2600 K, this dependence is described by an exponential dependence with a diffusion activation energy of 2.6 ± 0. 2 eV. In the superionic state (2600-3100 K), the activation energy of diffusion of an oxygen anion decreases to 1.88 ± 0.13 eV. In melt (3100-3600 K), the exponential dependence of the diffusion coefficient of O2- persists but the activation energy of diffusion decreases still further, to 0.8 ± 0.2 eV. Our experimental results agree (within the limits of experimental error) with data on oxygen diffusion in the crystalline phase obtained by other researchers.
AB - The structure of and oxygen diffusion in UO2 are studied by the molecular dynamics method in the range of transition to the superionic state (melting of the oxygen sublattice) and near the melting point of UO 2. The temperature dependence of the diffusion coefficient of a doubly charged oxygen ion in UO2 is constructed. In the crystalline state at temperatures between 1800 and 2600 K, this dependence is described by an exponential dependence with a diffusion activation energy of 2.6 ± 0. 2 eV. In the superionic state (2600-3100 K), the activation energy of diffusion of an oxygen anion decreases to 1.88 ± 0.13 eV. In melt (3100-3600 K), the exponential dependence of the diffusion coefficient of O2- persists but the activation energy of diffusion decreases still further, to 0.8 ± 0.2 eV. Our experimental results agree (within the limits of experimental error) with data on oxygen diffusion in the crystalline phase obtained by other researchers.
UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000188881600018
UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=1542613241
U2 - 10.1134/1.1648965
DO - 10.1134/1.1648965
M3 - Article
VL - 49
SP - 254
EP - 257
JO - Technical Physics
JF - Technical Physics
SN - 1063-7842
IS - 2
ER -
ID: 43422520