DISPLACIVE MODULATION AND CHEMICAL-COMPOSITION OF (BI,PB)2SR2CAN-1CUNO2N+4 (N = 2, 3) HIGH-TC SUPERCONDUCTORS

被引:59
作者
EIBL, O
机构
[1] Siemens Research Laboratories, W-8000 Munich 83
来源
PHYSICA C | 1991年 / 175卷 / 3-4期
关键词
D O I
10.1016/0921-4534(91)90617-8
中图分类号
O59 [应用物理学];
学科分类号
摘要
Electron diffraction and high-accuracy EDX microanalysis in the TEM clearly revealed the dependence of the displacive modulation on the Pb content in (Bi, Pb)2Sr2Ca(n-1)Cu(n)O2n+4 high-T(c) superconductors. A general rule was derived which correlates the amount of Pb in the crystal structure to the wave length of the modulation. With increasing Pb concentration the wave length of the modulation increases linearly and the relation between the Pb content and the wave length of the modulation is the same for both the n = 2 and the n = 3 material. The maximum Pb fraction was as high as Bi:Pb = 0.72:0.28 and resulted in an unmodulated crystal structure. The differences between the Pb modulation and the Bi modulation arise from a decrease of the displacement amplitudes parallel to the b direction and a zero component of the wave vector parallel to the c direction for the Pb modulation. Significant deviations from the ideal compositions 2212 and 2223 were detected by EDX microanalysis. A systematic (Sr+Ca) deficit was found for the n = 2 and n = 3 phases. EDX microanalysis also showed that as much as 20% of Ca can be substituted by Sr.
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页码:419 / 434
页数:16
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