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First-Principles Study on the Adsorption Behavior of O2 on the Surface of Plutonium Gallium System
Authors:Longxian Li  Min Zhu  Guikai Zheng  Yan Li  Yang Yang  Yilong Liu  Huan Su
Affiliation:1.College of Nuclear Science and Technology, Naval University of Engineering, Wuhan 430000, China; (L.L.); (Y.L.); (Y.Y.); (Y.L.); (H.S.);2.Unit 93671 of the Chinese People’s Liberation Army, Nanyang 473000, China
Abstract:To deeply understand the adsorption process of oxygen on the surface of a plutonium gallium system and to reveal the chemical reaction mechanism at the initial stage of oxidative corrosion on the surface of plutonium gallium alloy at a theoretical level, the adsorption behavior of oxygen molecules on the surface of a plutonium gallium system was investigated by a first-principles approach based on density flooding theory. The results show that the molecular bond length increases and finally breaks when the surface oxygen molecule is adsorbed on the surface of plutonium gallium system and dissociates into two atomic states. The most likely adsorption position of oxygen molecules on the surface of plutonium gallium system is hole-site vertical adsorption with the adsorption energy size of 10.7 eV. The bonding between oxygen atom and surface is mainly due to the overlapping hybridization of Pu-6s, Pu-7s, Pu-6d, Ga-3d and O-2p orbitals. Oxygen molecules mainly interact with the atoms of the first layer on the surface of the plutonium gallium system. The oxygen atoms after stable adsorption are able to diffuse to the subsurface of the plutonium gallium system after overcoming the energy barrier of 16.7 eV and form a stable structure. The research results reveal the initial reaction process and adsorption law of oxygen on the surface of plutonium gallium system from microscopic level, which is helpful to further explore the surface corrosion prevention technology of plutonium gallium system and improve the reliability and safety of plutonium gallium alloy components.
Keywords:surface adsorption   first principles   plutonium gallium alloy   the electronic structure
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