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題名 | Effect of Pb Doping in High-Tc Bi[feaf]Sr[feaf]CaCu[feaf]Oy Superconductors Studied by X-ray Absorption Near-edge Structure Spectroscopy=利用X光近吸收邊緣結構吸收光譜探討Bi[feaf]Sr[feaf]CaCu[feaf]Oy高溫超導體之鉛摻雜效應 |
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作者 | 張嵩駿; 羅里; 劉如熹; 陳錦明; 張凌雲; 李志甫; | 書刊名 | 真空科技 |
卷期 | 14:1 2001.04[民90.04] |
頁次 | 頁20-23 |
分類號 | 337.473 |
關鍵詞 | X光近吸收邊緣結構吸收光譜; 高溫超導體; 摻雜; X-ray absorption near-edge structure spectroscopy; XANES; |
語文 | 英文(English) |
中文摘要 | 本論文乃針對以固態反應法於空氣中合成之Bi-2212系列高溫超導體〔成分為(Bi2-xPbx)Sr2CaCu2Oy(0≦x≦0.3)〕,利用同步輻射光所得之X光近吸收邊緣結構吸收光譜(X-ray Absorption Near-edge Structure Spectroscopy;XANES)探討其銅氧平面上電洞濃度之變化。據上述研究可證實,Bi2212摻雜之鉛是以2+之形式存在;此外,隨著鉛含量之增加電洞濃度亦會隨之提昇。故於(Bi, Pb)-2212系統中,以Pb2+取代Bi3+之位置將會造成系統處於過度摻雜(Over-Doped)之狀態,然而此種效應可造成此系列樣品具較高之臨界電流密度。 |
英文摘要 | An investigation of the variation of hole concentration with in the CuO2 planes using X-ray absorption near-edge structure (XANES) spectroscopy with synchrotron radiation in the (Bi2-xPbx) Sr2CaCu2Oy(0≦x≦0.3)series of high-Tc superconductors synthesized by solid state reaction in air is presented. Pb is found to have the valence of 2+ in the samples of this series. Moreover, the hole concentration increases with increasing Pb content. The results lead us to conclude that the substitution of Pb2+ in the Bi3+ sites of the (Bi, Pb)-2212 system causes the compounds to be in the over-doped state. This effect results in the compounds having a high critical current density. |
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