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| 題名: | Bi2+x-zSr2-x+zCuOy (x=0-0.1;z=0-0.1)製備、結構與特性研究 |
| 其他題名: | Preparation, structure and properties of Bi2+x-zSr2-x+zCuOy (x=0-0.1;z=0-0.1) compounds |
| 作者: | 吳致賢;Wu, Chih-hsien |
| 貢獻者: | 淡江大學化學學系碩士班
高惠春;Kao, Huey-chuen I. |
| 關鍵詞: | 電洞濃度;摻雜;超導性;Bi2+x-zSr2-x+zCuOy;XANES;hole concentration;doping;Superconductivity;XANES;Bi2+x-zSr2-x+zCuOy |
| 日期: | 2005 |
| 上傳時間: | 2010-01-11 02:39:41 (UTC+8) |
| 摘要: | 本實驗以固態法製備了三系列正交晶系的Bi2+x-zSr2-x+zCuOy單相樣品，取代量為0 ≦ x, z ≦0.10。掃描式電子顯微鏡(SEM)觀察發現樣品多屬層狀結構。EDS分析發現樣品中Bi元素會有0.6 ~ 4.2% 揮發的情況出現。Bi2-zSr2+zCuOy與Bi2Sr2-xCuOy系列樣品的電洞濃度隨取代量增加而增加，有電洞摻雜的效應；反之，Bi2+xSr2CuOy系列樣品則有電洞充填效應。三個系列樣品在正常態時皆呈金屬性；低溫時，會轉變成超導態，Tc(onset) 均隨取代量增加而下降。未取代樣品(Bi2Sr2CuOy)具有最高的Tc(onset)，其值為7.9 K，電洞濃度為0.237。XANES光譜分析所得的相對電洞濃度與碘間接滴定法所得結果變化一致。
In this research, sigle phase orthorhombic Bi2+x-zSr2-x+zCuOy compounds with 0 ≦ x, z ≦ 0.10 were prepared by a solid state reaction method. Laminar structure is observed for all the samples under SEM. EDS analysis show that Bi is volatile, the depletion amount is in the range of 0.6 ~ 4.2%. Hole concentration of the Bi2-zSr2+zCuOy and Bi2Sr2-xCuOy series samples increases with increasing x (or z), showing a hole doping effect. In contrary, Bi2+xSr2CuOy series samples show a hole filling effect. Bi2+x-zSr2-x+zCuOy series samples are metallic in normal state and they are superconductors at lower temperature. Tc(onset) decreases with increasing x (or z). Bi2Sr2CuOy has the highest Tc at 7.9 K with an optimal hole concentration of 0.237. Hole concentration obtained from XANES and iodometric titration agrees well in the Bi2+x-zSr2-x+zCuOy compounds. |
| DOI: | 10.6846%2fTKU.2005.00750 |
| 顯示於類別: | [化學學系暨研究所] 學位論文
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