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Citation: Zhao Liang-Zhong, Guo Zhong-Cheng, Liang Zhen-Hua, Hu Yu-Xiu, Liu Han-Fan. Variations in the Elemental Concentration in Surface Region of the YBCO Films and Interactions of the Films with Substrate in Heating Process Studied by Angular Deprndent XPS[J]. Acta Physico-Chimica Sinica, ;1991, 7(03): 305-310. doi: 10.3866/PKU.WHXB19910309 shu

Variations in the Elemental Concentration in Surface Region of the YBCO Films and Interactions of the Films with Substrate in Heating Process Studied by Angular Deprndent XPS

1.
Institute of Chemistry, Academia Sinica, Beijing 100080

Received Date: 9 March 1990
Available Online: 15 June 1991

Variations of the elemental concentration of the YBCO films prepared by MOD method, diffusion and interactions between the films and ZrO_2 substrate have been studied by means of angular dependent XPS technique. A drastic change in the stoichiometry of YBCO films in surface region at different heating steps have been observed. For example, Cu~(2+)-enrichment and Ba~(2+)-deficiency occur in surface region for both thin (～0.1 μm) and thick (1～1.5 μm) films after heating the samples at about 530°～720 ℃. However, above 800 ℃ Cu~(2+)-deficiency is observed clearly, and the higher the temperature, the more the Cu~(2+)-deficiency. In addition, the extent of interdiffusion and interaction also increases with increasing temperature. After heating at 800 ℃ diffusion of Ba~(2+) From the thin film into ZrO_2 substrate is detected, and the valence of copper is +2. Whereas, with a heating temperature of 950 ℃, a Ba~(2+)-rich layer on the substrate has been formed, and the valence of copper on the layer is mainly +1. The results also show that degradation of the superconducting property caused by the diffusion and interaction is more severe for the thin film than for thick film.
- Angular dependent XPS; YBCO film; Surface chemistry
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