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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. shu

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

1.
Institute of Chemistry, Academia Sinica Beijing

Received Date: 8 October 1987
Available Online: 21 March 1988

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.
- X-ray Photoelectron,
- Spectroscopy(XPS),
- Superconductor of Y-Ba-Cu-O type
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