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1.超导体表面的化学态(Ⅱ) 从结合能数据来看,Y(1)和Cu的结合能非常近似于相应氧化物Y_2O_3和CuO。然而表征超导体的Ba(1)和O(1)有些特殊,Ba在周期表中为强金属性元素,极易丢失(6s)~2电子,即使在金属中也要电离成导带电子,使得金属Ba~0和离子Ba~(+2)结合能十分相似,甚至金属钡结合能反而大一点,然而和众多的钡化合物相比,超导体中Ba(1)的结合能偏低,似乎在电子的受授过程中,有较多电子偏向于钡,另外也可能由于超导体的Ba与所有晶格氧
1. The chemical state of superconductor surface (Ⅱ) From the binding energy data, Y (1) and Cu binding energy is very similar to the corresponding oxide Y_2O_3 and CuO. However, Ba (1) and O (1), which characterize superconductors, are somewhat special. Ba is a strong metallic element in the periodic table and is easily lost (6s) to 2 electrons even if it is ionized into conduction band electrons in the metal, The bonding energies of Ba ~ 0 and Ba ~ (+2) are very similar, and even the binding energy of metal Ba is larger. However, the Ba (1) binding energy of superconductors is lower than that of many Ba compounds. Of the grant process, there are more electrons tend to barium, in addition it may also be due to the superconducting Ba and all lattice oxygen