引用本文:
赵良仲, 胡玉秀, 陈德俊, 朱道本, 扬德亮, 侯可悦. Y-Ba-Cu-O体系超导材料的表面分析和热稳定性研究[J]. 应用化学,
1988, 5(5): 58-62.
Citation: Zhao Liangzhong, Hu Yuxiu, Cheng Dejun, Zhu Daoben, Yang Deliang, Hou Keyue. SURFACE ANALYSIS AND THERMAL STABILITY STUDY ON Y-Ba-Cu-O SUPERCONDUCTOR[J]. Chinese Journal of Applied Chemistry, 1988, 5(5): 58-62.
Citation: Zhao Liangzhong, Hu Yuxiu, Cheng Dejun, Zhu Daoben, Yang Deliang, Hou Keyue. SURFACE ANALYSIS AND THERMAL STABILITY STUDY ON Y-Ba-Cu-O SUPERCONDUCTOR[J]. Chinese Journal of Applied Chemistry, 1988, 5(5): 58-62.
Y-Ba-Cu-O体系超导材料的表面分析和热稳定性研究
摘要:
XPS研究表明,在空气中久置后的Y2O3,BaO和CuO以及YBa2Cu3O~7,超导体的表面都生成有碳酸盐.超导体中的元素价态为:钇+3价,钡+2价,铜主要+2价.原料CuO在真空中在400℃加热后大部分被还原成Cu2O;制备不久的超导体在同样条件下其Cu2+离子较难还原,然而在空气中久置后的超导体中的Cu2+又较易还原.这些现象既反映了原料氧化物经烧结后由于生成了YBa2Cu3O~7相而增加了稳定性,又说明这种超导材料仍具有亚稳性质.
-
关键词:
- X光电子能谱(XPS)
- / 钇钡铜氧超导体
- / 元素价态
English
SURFACE ANALYSIS AND THERMAL STABILITY STUDY ON Y-Ba-Cu-O SUPERCONDUCTOR
Abstract:
XPS studies show that carbonates are formed on the surfaces of Y2O3,BaO,CuO and YBa2Cu3O~7 superconductor therefrom stored in air.The valence states of the elements on the surface of the superconductor are follows:Y3+,Ba2+ and Cu2+.Individual raw CuO can be converted mostly into Cu2O after heating at 400℃ under high vacuum,while in newly prepared superconductor at the same conditions only a small portion of Cu2+ ions are converted to Cu1+ ions.These results indicate that sintering enhanced the stability of Y-Ba-Cu-Osystem. However,for the superconductor stored long in air this conversion of Cu2+ to Cu1+ takes place readily,which reflects that the"ceramic superconductor"does not behave as a true ceramic in stability,it still shows a "metastable" feature.
-
Key words:
- X-ray Photoelectron
- / Spectroscopy(XPS)
- / Superconductor of Y-Ba-Cu-O type
-
-
扫一扫看文章
计量
- PDF下载量: 0
- 文章访问数: 0
- HTML全文浏览量: 0
下载:
