中华医学超声杂志

应用化学 ›› 1988, Vol. 0 ›› Issue (5): 58-62.

• 研究论文 • 上一篇    下一篇

Y-Ba-Cu-O体系超导材料的表面分析和热稳定性研究

赵良仲, 胡玉秀, 陈德俊, 朱道本, 扬德亮, 侯可悦   

  1. 中国科学院化学研究所 北京
  • 收稿日期:1987-10-08 修回日期:1988-03-21 出版日期:1988-10-10 发布日期:1988-10-10

SURFACE ANALYSIS AND THERMAL STABILITY STUDY ON Y-Ba-Cu-O SUPERCONDUCTOR

Zhao Liangzhong, Hu Yuxiu, Cheng Dejun, Zhu Daoben, Yang Deliang, Hou Keyue   

  1. Institute of Chemistry, Academia Sinica Beijing
  • Received:1987-10-08 Revised:1988-03-21 Published:1988-10-10 Online:1988-10-10

PDF

437

被引次数

3

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

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 as 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, Valency state of elements

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