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Influence of oxygen vacancies on the EPIR effect in Nd0.7Sr0.3MnO3 ceramics
Dawei Shi,Shunsheng Chen,Di Liu,Lingfang Xu,Haibo Xiao,Changping Yang,Kaiying Wang 한국물리학회 2015 Current Applied Physics Vol.15 No.8
Nd0.7Sr0.3MnO3 polycrystalline ceramic samples (NSMO) were synthesized by solid state reaction with a post annealing for parts of samples under different partial pressures of oxygen at 1350 ℃ for 12 h. XRD shows that all the samples are in single phase with a perovskite structure. The electrical transport measurement implies that the oxygen concentration has an important influence on the electrical pulse induced resistance, i.e. the EPIR-effect, for NSMO samples. For the oxygen-enriched sample, which probably contains a smaller amount of oxygen vacancies, the I-V characteristic is linear with a very small resistance, and the EPIR-effect is not detectable within the experimental accuracy. However, after sintered and annealed in reducing atmospheres, an EPIR effect appears and even becomes stronger and more stable if the sintering atmosphere is more reducing than that of normal air condition. Besides, the I -V becomes nonlinear and the initial resistance increases with increasing deficiency of oxygen, which means that the oxygen vacancies and their deep level trap states play an important role for the EPIR effect of NSMO. In this manuscript, an oxygen vacancy trapped state model is put forward to explain the relation between oxygen concentration and the EPIR effect.
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Solving point burnup equations by Magnus method
Yun Cai,Xingjie Peng,Qing Li,Lin Du,Lingfang Yang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
The burnup equation of nuclides is one of the most equations in nuclear reactor physics, which isgenerally coupled with transport calculations. The burnup equation describes the variation of the nuclideswith time. Because of its very stiffness and the need for large time step, this equation is solved byspecial methods, for example transmutation trajectory analysis (TTA) or the matrix exponential methodswhere the matrix exponential is approximated by CRAM. However, TTA or CRAM functions well whenthe flux is constant. In this work, a new method is proposed when the flux changes. It's an improvedmethod compared to TTA or CRAM. Furtherly, this new method is based on TTA or CRAM, and it is moreaccurate than them. The accuracy and efficiency of this method are investigated. Several cases are usedand the results show the accuracy and efficiency of this method are great.
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