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Effect of silver addition on the microstructure of YBa2Cu3O7−x

  • Jondo Yun (a1), Martin P. Harmer (a1) and Ye T. Chou (a1)

Abstract

The variation of grain morphology in silver-doped YBa2Cu3O7−x was investigated as a function of sintering temperature, atmosphere, and amount of Ag addition. In the presence of the liquid phase formed at 925 °C for undoped samples, and at 910 °C for silver-doped samples, the grain shape and size changed drastically from small and nearly equiaxed to large and elongated. The anisotropy in the grain shape was sensitive to both the silver content and the atmosphere. On the other hand, while the grain size was generally insensitive to the atmosphere, it decreased as the silver content increased. The silver phase, if sufficiently large, would block the grain growth in the matrix. The amount of silver for effective blocking was predicted from a microstructural model, and the prediction was in agreement with experimental results.

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1Jin, S., Tiefel, T. H., Sherwood, R. C., Davis, M. E., van Dover, R. B., Kammlott, G. W., Fastnacht, R. A., and Keith, H. D., Appl. Phys. Lett. 52, 2074 (1988).
2Zhang, L., Chan, H., and Harmer, M. P., in High-Temperature Superconductors: Fundamental Properties and Novel Materials Processing, edited by Christen, D., Narayan, J., and Schneemeyer, L. (Mater. Res. Soc. Symp. Proc. 169, Pittsburgh, PA, 1990), p. 271.
3Yun, J., Harmer, M. P., Chou, Y. T., and Arora, O. P., in Superplasticity in Advanced Materials, edited by Hori, S. and Furushiro, N. (Japan Soc. Res. Superplasticity, Japan, 1991), p. 275.
4Yun, J., Harmer, M. P., and Chou, Y. T., Scripta Metall. et Mater. 29, 267 (1993).
5Nishio, T., Itoh, Y., Ogasawara, F., Suganuma, M., Yamada, Y., and Mizutani, U., J. Mater. Sci. 24, 3228 (1989).
6Yeh, F. and White, K. W., J. Appl. Phys. 70, 4989 (1991).
7Singh, J. P., Leu, H. J., Poeppel, R. B., Van Voorhees, E., Goudey, G. T., Winsley, K., and Shi, D., J. Appl. Phys. 66, 3154 (1989).
8Dwir, B., Affronte, M., and Pavuna, D., Physica C 162–164, 351 (1989).
9Imanaka, N., Saito, F., Imai, H., and Adachi, G-y., JJAP 28, L580 (1989).
10Chang, C. A. and Tsai, J. A., Appl. Phys. Lett. 53, 1976 (1988).
11Yoshizawa, S., Ogawa, Y., Yamamoto, K., Ishikawa, Y., and Shiomi, K., in Adv. Supercond. II, Proc. 2nd Int. Symp. Supercond. (ISS'89), edited by Ishiguro, T. and Kajimura, K. (Springer-Verlag, Tokyo, 1989), p. 223
12Chang, E. K., Kirschner, M. J., Hong, D. J.L., and Smyth, D.M., in Processing-Microstructure-Property Relationship III, presented in ACerS. Annual Meeting in Indianapolis (1989).
13Handbook of Chemistry and Physics, 62nd ed., edited by West, R. C. and Astle, M.J. (CRC Press, Boca Raton, FL, 1981).
14Yun, J., Güven, G., and Chou, Y. T., J. Mater. Sci. Lett. 12, 1080 (1993).
15ASTM Designation E112-85, Annual Book of ASTM Standards (ASTM, Philadelphia, PA, 1986).
16Lay, K. W. and Renlund, G. M., J. Am. Ceram. Soc. 73, 1208 (1990).
17Ullman, J. E., McCallum, R.W., and Verhoeven, J.D., J. Mater. Res. 4, 752 (1989).
18Aselage, T. and Keefer, K., J. Mater. Res. 3, 1279 (1988).
19Roth, R. S., Rawn, C. J., Beech, F., Whitler, J. D., and Anderson, J. O., in Ceram. Supercond. II, edited by Yan, M.F. (The American Ceramic Society, Westerville, OH, 1988), p. 13.
20Yan, M. F., Barns, R. L., O'Bryan, H. M. Jr., Gallagher, P. K., Sherwood, R. C., and Jin, S., Appl. Phys. Lett. 51, 532 (1987).
21Yan, M. F., Cannon, R. M., and Bowen, H. K., in Ceramic Microstructure '76, edited by Fulrath, R. M. and Pask, J. A. (Westview Press, Boulder, CO, 1976), p. 276.
22Kooy, C., in Sci. Ceram., edited by Stewart, G. H. (Academic Press, London, 1962), Vol. 1, p. 21.
23Kaysser, W. A., Sprissler, M., Handwerker, C. A., and Blendell, J. E., J. Am. Ceram. Soc. 70, 339 (1987).
24Song, H. and Coble, R., J. Am. Ceram. Soc. 73, 2077 (1990).
25Bennison, S. J. and Harmer, M. P., J. Am. Ceram. Soc. 68, C22 (1985).
26German, R. M., in Liquid Phase Sintering (Plenum Press, New York, 1985), Chap. 2.
27Schmid, H. and Rühle, M., J. Mater. Sci. 19, 615 (1984).
28Bateman, C. A., Bennison, S. J., and Harmer, M. P., J. Am. Ceram. Soc. 72, 1241 (1989).
29Deslandes, F., Raveau, B., Dubots, P., and Legat, D., Solid State Commun. 71, 407 (1989).
30French, J. D., Harmer, M. P., Chan, H. M., and Miller, G. A., J. Am. Ceram. Soc. 73, 2508 (1990).
31Lange, F. F. and Hirlinger, M. M., J. Am. Ceram. Soc. 67, 164 (1984).
32Wagner, C., Z. Elektrochem. 65, 581 (1961).
33Exner, H. E. and Lukas, H. L., Metallography 4, 325 (1971).

Effect of silver addition on the microstructure of YBa2Cu3O7−x

  • Jondo Yun (a1), Martin P. Harmer (a1) and Ye T. Chou (a1)

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