Copper valency of superconducting phases
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F.H. Chen; H.S. Koo; S.C. Wu; T.Y. Tseng; S.R. Horng; M.F. Tai
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Article
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1992
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Elsevier Science
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English
โ 414 KB
Pb-doped Bi-Sr-Ca-Cu high-To superconducting oxides have been prepared by a modified sol-gel process via the EDTA route. Upon decomposing the X-ray photoemission spectrum of the Cu 2pa/2 core level of the superconducting oxide into three components Cu ~+, Cu 2 + and Cu 3+, we have found an obvious t