The oxygen in- and out-diffusion behavior in melt-textured YBCO measured by thermogravimetry

Zhang Yu-Long; Yao Xin; Zhang Hong; Jin Yan-Ping

doi:10.7498/aps.54.3380

Abstract
The chemical oxygen in- and out-diffusion in melt-textured YBa2Cu 3O7-δ（YBCO）is investigated by thermogravimetry. The weight relaxations resulting from the sudden change of temperature at a fixed oxygen partial pressure of 033×１０5Pa are recorded. By fitting the isothermal curves, the chemical diffusion coefficients at 375—600℃ are determined. It is found that the resultant numerical values for melt-textured YBCO are larger than that of crushed single crystal YBCO obtained in our previous study by about 50%, whereas all of them are of the order of 10-10cm2s-1 . The activation energies for both samples are estimated as ～1eV. It is believed that those values represent the nature of the lattice diffusion. The oxygen diffusion in me lt-textured-grown-YBCO is attributed to the YBCO matrix and the micro-cracks are responsible for the huge diffusion coefficients. Moreover, the same kinetics o f in- and out-diffusion is confirmed to be intrinsic, and it suggests that the d ifferent in- and out-diffusion coefficients measured in other works are controll ed by the large concentration gradient and the shell effect.

Keywords:
high temperature superconductor /

melt-texture /

oxygen diffusion /

th ermogravimetry
Authors and contacts
Zhang Yu-Long²,

Yao Xin³,

Zhang Hong⁴,

Jin Yan-Ping¹

(1)上海交通大学金属基复合材料国家重点实验室，上海 200030; (2)上海交通大学物理系，上海 200030; (3)上海交通大学物理系，上海 200030;上海交通大学金属基复合材料国家重点实验室，上海 200030; (4)中国科学院上海微系统与信息技术研究所，上海 200050
References

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Vol. 54, Issue 7 - 2005-04-05

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The oxygen in- and out-diffusion behavior in melt-textured YBCO measured by thermogravimetry

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