氧还原气氛（O2 + N2）退火Bi，Pb-2223复合材料晶格中氧原子的位移波
Displacement Waves of Oxygen Atoms in Bi,Pb-2223 Lattice of Composites Annealed in Oxygen Reduced (O2+N2) Atmosphere
摘要：
Bi，Pb-2223/Ag复合材料在（O_2 + N_2）气氛中820- 780 ℃退火可减少伴生相的数量，使晶粒间的接触更紧密，提高临界电流。本研究的目的是揭示在还原氧气氛中退火时2223晶格的变化，阐明这些变化的原因，并讨论它们对陶瓷超导电性的影响。退火后的2223相的电子衍射分析发现，在2223相中存在[010]2223方向的氧原子横向偏振位移波。X射线光电子能谱和核微区分析结果表明，氮不与2223晶格发生相互作用，氧指数降低到9.67，低于化学计量比。因此，原子位移波是由于Bi-O双层膜中缺少氧而产生的。
英文摘要：
Annealing of Bi,Pb-2223/Ag composites in (O2+N2) atmosphere at 820-780C is believed to reduce the number of the accompanying phases, to make contacts between crystallites closer and to increase the critical current. The goals of this study were to reveal the changes in the 2223 lattice at annealing in the reduced oxygen atmosphere, to elucidate the reasons of these changes and to discuss their effect on the ceramics superconductivity. After the annealing the transversely-polarized displacement waves of oxygen atoms in [010]2223 direction have been found in the 2223 phase by electron diffraction analysis. These waves could appear due to the lack of oxygen in the 2223 lattice or to the nitrogen penetration in it. As demonstrated by the X-ray photo-electron spectroscopy and nuclear microanalysis, nitrogen does not interact with the 2223 lattice, and the oxygen index decreases to 9.67, which is lower than the stoichiometric. Thus, the atomic displacement waves result from the lack of oxygen in Bi-O bilayers.
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