Effect of Specific Surface Area on Growth and Porosity of Oxide Superconducting Ceramic YBCO Single Domain

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Trans Tech Publications Ltd

外文摘要：The effect of specific surface area on the growth and the porosity of oxide ceramic superconductor YBCO single domain are investigated. The enhancement of growth depth depends on the large specific surface area σ. When the specific surface area a is more than the critical value 200mm~2/g, the YBCO single domain is full-growth in the sample of size Φ20mm×18mm. It reveals that a large specific surface area providing an effective tunnel of oxygen diffusion for the crystal growth. On the other hand, this tunnel makes oxygen gas emitting out resulting in porosity diameter decreased. The mean porosity diameter is observed as 5μm in hole sample smaller than 80μm in plain sample. The porosity distribution is calculated as 1/(100μm)~2 in plain sample and 8/(10μm)~2 in hole sample.

外文关键词：

superconductor YBCOspecific surface areagrowthporosity

作者：

C P Zhang、X Chaud、H T Cao、E Beaugnon、L Zhou

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作者单位：

State Key Laboratory of Solidification Processing, Northwest Polytechnical University, Xi'an, 710072 China SMRC, Northwest Institute for Non-ferrous Metal Research, Xi'an, 710016 China Physical Material Dept., Universite Joseph Fourier, Grenoble, 38000 France

CRETA/CNRS, BP166, Grenoble Cedex 9, 38042 France

State Key Laboratory of Solidification Processing, Northwest Polytechnical University, Xi'an, 710072 China

CRETA/CNRS, BP166, Grenoble Cedex 9, 38042 France Physical Material Dept., Universite Joseph Fourier, Grenoble, 38000 France

State Key Laboratory of Solidification Processing, Northwest Polytechnical University, Xi'an, 710072 China SMRC, Northwest Institute for Non-ferrous Metal Research, Xi'an, 710016 China

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出版年：

2010

DOI：

10.4028/www.scientific.net/KEM.434-435.346

Key engineering materials

ISSN：1013-9826

年,卷(期)：2010.434/435

被引量1
参考文献量12