Abstract
The YBCO/Ag superconducting composites were fabricated by compressing powders of YBCO and silver mixed at various volume proportions 0 to 100% under pressures of 2.0 and 5.4 GPa and subsequently sintering at 900 °C for 10 h in a flowing oxygen atmosphere. The superconducting transition temperature, particularlyT c (R=0), was found to retain the value above 85 K up to 50 vol % Ag while the normal resistivity at 300 K to reduce below 10 μΩcm. The highestJ c of 400 Acm−2 was attained for the sample containing 20 vol % Ag pressed at 5.4 GPa. The mechanical properties were also improved by the addition of silver: the compressive strength is increased by two to three times and the maximum strain, which is a measure of ductility, reached a value almost four times as large as that in the pure YBCO prepared under the ordinary pressure of 0.5 GPa. The persistence of the superconducting characteristics up to 70 vol % Ag is discussed in terms of the microstructure taken with the scanning electron microscope.
Similar content being viewed by others
References
O. Kohno, Y. Ikeno, N. Sadakata andK. Goto,Jpn J. Appl. Phys.27 (1988) L77.
V. Plechacek, V. Landa, Z. Blazek, J. Sneidr, Z. Trejbalova andM. Cermak,Physica C153–155 (1988) 878.
G. Xiao, F. H. Streitz, M. H. Cieplak, A. Bakhshai, A. Gavrin andC. L. Chien,Phys. Rev.B38 (1988) 776.
T. Nishio, Y. Itoh, F. Ogasawara, M. Suganuma, Y. Yamada andU. Mizutani,J. Mater. Sci.,24 (1989) 3228.
A. Ono andY. Ishizawa,Jpn J. Appl. Phys.26 (1987) L1043
N. Kawahara, H. Enami, Y. Kitoh, T. Shinohara, S. Kawabata, H. Hoshizaki, A. Matsumuro andT. Imura,ibid.28 (1989) L615.
B. P. Singh, S. K. Agarwal, B. Jayaram, R. K. Nayar, K. C. Nagpal andA. V. Narkikar,ibid.27 (1988) L1116.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Matsumuro, A., Kasumi, K., Mizutani, U. et al. Superconducting and mechanical properties of YBCO/Ag composites fabricated at high pressures up to 5.4 GPa. J Mater Sci 26, 737–742 (1991). https://doi.org/10.1007/BF00588312
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00588312