Light impurity atoms as the probes for the electronic structures of actinide dioxides

Light impurity atoms as the probes for the electronic structures of actinide dioxides
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轻杂质原子作为二锕系元素电子结构的探针

DOI:
10.1016/j.commatsci.2017.10.003
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发表时间:
2018-02
影响因子:
3.3
通讯作者:
Peng Shi
Peng Shi
中科院分区:
材料科学3区
文献类型:
--
作者:
Bingyun Ao;Ruizhi Qiu;Guangfeng Zhang;Zhen Pu;Xiaolin Wang;Peng Shi

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利用第一性原理密度泛函理论计算了七种锕系二氧化物AnO2(An: Th、Pa、U、Np、Pu、Am和Cm)中十种轻杂质X (X: H、He、Li、Be、B、C、N、O、F和Ne)的形成能,以阐明X的相对稳定性,并得到杂质行为的一些趋势。Hubbard参数用于描述5f电子的强相关电子行为。结果表明,X的形成能显著取决于AnO2和X的性质。对于AnO2的八面体间隙位上的X,由于其强氧化性,F是所有AnO2中唯一能量有利的杂质;PaO2中的H、PaO2和UO2中的O、PuO2、amo2和CmO2中的Li、amo2和CmO2中的Be也在能量上有利。X的氧化性或还原性以及5f电子在锕系元素间的离域→局域跃迁可以解释X在AnO2中的行为趋势。特别地,选择了H这一非常典型的两性元素来说明它在AnO2中的不同存在状态。H倾向于占据早期AnO2的八面体间隙位,或在后期形成羟基。
First-principles density functional theory are used to calculate the formation energies of ten light impurities X (X: H, He, Li, Be, B, C, N, O, F and Ne) in seven actinide dioxides AnO2(An: Th, Pa, U, Np, Pu, Am and Cm), in order to elucidate the relative stability of X and to obtain some trends of impurities behaviors. The Hubbard parameterUis used to describe the strongly correlated electron behavior of An 5felectrons. The results indicate that the formation energies of X significantly depend on the properties of AnO2and X. For X at the octahedral interstitial sites of AnO2, F is the only energetically favorable impurity for all AnO2, owing to its strong oxidability; H in PaO2, O in PaO2and UO2, Li in PuO2, AmO2and CmO2, Be in AmO2and CmO2are also energetically favorable. The oxidability or reductivity of X and the delocalization → localization transition of 5f electrons across actinide series can account for the trends of the behaviors of X in AnO2. Particularly, H, a very typical amphoteric element, is chosen to illustrate its difference existence states in AnO2. H prefers to occupy the octahedral interstitial sites of early AnO2or form hydroxyl group in the later AnO2.
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