Influence of Pb on the stability of the Bi-type modulated structure

被引：3

作者：

机构：

[1] Chen, Xianhui

[2] Xu, Cheng

[3] Cao, Liezhao

[4] Chen, Zhaojia

来源：

Chen, Xianhui | 1600年 / 208期

关键词：

Annealing - Bismuth compounds - Copper oxides - Crystal lattices - Doping (additives) - Lead - Nitrogen - Oxygen - Stability - Structure (composition);

D O I：

10.1016/0921-4534(93)90666-E

中图分类号：

学科分类号：

摘要：

The mechanism of the Bi-type modulated structure was studied in Bi-based high-temperature superconductors with nominal compositions of Bi2Sr2CaCu2Oy, Bi1.85Pb0.15Sr2CaCu2Oy and Bi1.8Pb0.35Sr2Ca2Cu3Oy. It was found that the three samples annealed in oxygen flow showed the presence of Bi-type modulation in electron diffraction patterns; after the samples were annealed in nitrogen atmosphere the Bi-type modulation still existed for the sample Bi2Sr2CaCu2Oy but disappeared completely for the Pb-doped samples Bi1.85Pb0.15Sr2CaCu2Oy and Bi1.8Pb0.35Sr2Ca2Cu3Oy. This suggests that doping Pb in the Bi-Sr-Ca-Cu-O system strongly changes the stability of the Bi-type modulation. It is confirmed that the driving force of Bi-type modulation is not the consequence of extra oxygen for the charge balance, but the adjustment of the BiO layer to the lattice mismatch.

引用

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