A COMPARATIVE XPS STUDY OF BI2SR2CACU2O8 AND BI1.6PB0.4SR2CACU2O(8) COMPOUNDS
A COMPARATIVE XPS STUDY OF BI2SR2CACU2O8 AND BI1.6PB0.4SR2CACU2O(8) COMPOUNDS
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DOI：
10.1016/0921-4534(94)91737-x
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发表时间：
1994-12-01
期刊：
影响因子：
1.7
通讯作者：
MARCUS, P
中科院分区：
文献类型：
--
作者：
VANHUONG, CN;HINNEN, C;MARCUS, P
利用XPS研究了Pb掺杂对2212超导体电子结构的影响。材料成分的核心能级光谱随样品处理的变化表明，450 摄氏度的原位加热可以获得其特性很好地代表了本体特性的表面。通过对高分辨率XPS光谱的详细分析，我们推断出这些离子以Cu-(2+epsilon+)、Sr2+、Ca2+、Pb2+和Bi3+的形式存在，并且晶格晶体中的每个Sr和Ca离子都有两个占据位点：Sr-O层和Ca层。 Pb 最显着的影响涉及超导体热稳定性的增强，证明 Bi-O 平面之间可能存在诱导更强的相互作用
The influence of Pb doping on the electronic structure of 2212 superconductor was investigated by XPS. The evolution of the core level spectra of the material components as a function of the sample treatment has shown that in situ heating at 450 degrees C allows to gain surface whose properties represent well those of the bulk. From detailed analysis of the high resolution XPS spectra we have deduced that the ions exist as Cu-(2+epsilon+), Sr2+, Ca2+, Pb2+ and Bi3+ and that each Sr and Ca ions in the lattice crystal have two occupation sites, Sr-O layer and Ca layer. The most remarkable influence of Pb concerned the enhancement of the thermal stability of the superconductor, proving the probable existence of an induced stronger interaction between Bi-O planes