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Spray pyrolysis of YBCO precursors

Published online by Cambridge University Press:  03 March 2011

Gideon S. Grader ,
Darío R. Machado  and
Raphael Semiat
Gideon S. Grader
Affiliation:
Chemical Engineering Department and the Crown Center for Superconductivity, Technion, Haifa 32000, Israel
Darío R. Machado
Affiliation:
Chemical Engineering Department and the Crown Center for Superconductivity, Technion, Haifa 32000, Israel
Raphael Semiat
Affiliation:
Chemical Engineering Department and the Crown Center for Superconductivity, Technion, Haifa 32000, Israel
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Abstract

Acetate, nitrate, and oxalate precursors for YBCO have been spray pyrolyzed under different conditions. Shelled and nonhollow microparticles were obtained from acetate and nitrate precursors, while nonhollow agglomerates were obtained from the oxalate suspension. At low furnace temperatures, the temperature and residence time of the particles were insufficient for complete decomposition of the precursors leading to Cu2O and Cu metal in the product. At 900 °C and above, reduced forms of CuO were not detected by x-ray measurements, and up to ∼60 wt.% YBCO was obtained. An approximate model predicting the particle and gas temperatures along the reactor under different operating conditions was developed. The model demonstrates that under the experimental conditions used here, the absorbed radiation heat by the particles from the furnace walls is significant in heating the gas. The gas and the particle temperatures are fairly close due to the effective heat transfer to the particles. At furnace temperatures of 700 °C, the maximum predicted particle temperature is about 500 °C (for ∼1 s). This explains the incomplete reactions obtained under these conditions. Above 900 °C the reactions are predicted to be complete within the first half of the furnace, leaving sufficient residence time for partial conversion into YBCO. Finally, an approximate expression predicting the relative contribution to the gas heating by the walls and the aerosol has been developed.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2490 - 2500
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

1Cava, R. J., Batlogg, B., van Dover, R. B., Murphy, D. W., Sunshine, S., Siegrist, T., Remeika, J. P., Rietman, E. A., Zahurak, S., and Espinosa, G. P., Phys. Rev. Lett. 58, 1676 (1987).CrossRefGoogle Scholar
2Frase, K. G. and Clarke, D. R., Adv. Ceram. Mat. 2, 295 (1987).Google Scholar
3Ling, H. C., J. Mater. Sci. 25, 3297 (1990).CrossRefGoogle Scholar
4Naveh, J. and Pelly, J., Mater. Res. Bull. XXIV, 283 (1989).CrossRefGoogle Scholar
5Shter, G. E. and Grader, G. S., J. Am. Ceram. Soc. (1994, in press).Google Scholar
6Kodas, T. T., Angew. Chem. Int. Ed. Engl. Adv. Mater. 28 (6), 794 (1989).CrossRefGoogle Scholar
7Sproson, D. W., Messing, G. L., and Gardner, T. J., Ceram. Int. 12, 3 (1986).CrossRefGoogle Scholar
8Ruthner, M. J., in Ceramic Powders, edited by Vincenzini, P. (Elsevier, Amsterdam, 1983), pp. 515–531.Google Scholar
9Awano, M., Takao, Y., Kani, K., and Takagi, H., J. Chem. Eng. Jpn. 25 (5), 508 (1992).CrossRefGoogle Scholar
10Kodas, T. T., Lee, V. Y., and Engler, E. M., Appl. Phys. Lett. 54, 1923 (1989).CrossRefGoogle Scholar
11Pebler, A. and Charles, R. G., Mater. Res. Bull. XXIV, 1069 (1989).CrossRefGoogle Scholar
12Tohge, N., Tatsumisago, M., Minami, T., Okuyama, K., Adachi, M., and Kousaka, Y., Jpn. J. Appl. Phys. 7, L292 (1988).Google Scholar
13Zhou, D., Biswas, P., Oostens, J., and Boolchand, P., J. Am. Ceram. Soc. 76 (3), 678 (1993).CrossRefGoogle Scholar
14Zhang, S. C., Messing, G. L., and Huebner, W., J. Aerosol Sci. 22 (5), 585 (1991).CrossRefGoogle Scholar
15Chadda, S., Ward, T., Carim, A., Kodas, T. T., Ott, K., and Kroeger, D., J. Aerosol Sci. 22 (5), 601 (1991).CrossRefGoogle Scholar
16Kim, I. T., Oh, T. S., and Kim, Y. H., J. Mater. Sci. 26, 6275 (1991).CrossRefGoogle Scholar
17Hussain, A. A. and Sayer, M., J. Supercond. 4, 385 (1991).CrossRefGoogle Scholar
18Biswas, P., Zhou, D., Zitkovsky, I., Blue, C., and Boolchand, P., Mater. Lett. 8 (6,7), 233 (1989).CrossRefGoogle Scholar
19Lakis, R. E. and Butler, S. R., 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. 385.Google Scholar
20Tohge, N., Tatsumisago, M., Minami, T., Okuyama, K., Arai, K., and Kousaka, Y., Jpn. J. Appl. Phys. 28 (7), L1175 (1989).CrossRefGoogle Scholar
21Kodas, T. T., Carim, A. H., and Ott, K. C., 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. 381.Google Scholar
22Charlesworth, D. H. and Marshall, W. R. Jr., AIChE J. 6 (1), 9 (1960).CrossRefGoogle Scholar
23Messing, G. L., private communication (1993).Google Scholar
24Okuyama, K., Ushio, R., Kousaka, Y., Seinfeld, J. H., and Flagan, R. C., Int. Chem. Eng. 32 (4), 750 (1992).Google Scholar
25Friedlander, S. K., Ann. New York Acad. Sci. 404, 354 (1983).CrossRefGoogle Scholar
26Pratsinis, S. E., J. Colloid Inter. Sci. 124 (2), 416 (1988).CrossRefGoogle Scholar
27Zhang, S. C., Messing, G. L., and Borden, M., J. Am. Ceram. Soc. 73 (1), 61 (1990).CrossRefGoogle Scholar
28Hubbard, C. R. and Snyder, R. L., Powder Diff. 3 (2), 74 (1988).CrossRefGoogle Scholar
29Powder Diffraction File, International Centre for Diffraction Data, Swarthmore, PA (1977).Google Scholar
30Shelukar, S. D., Sundar, H.G. K., Semiat, R., Richardson, J. T., and Luss, D., J. Am. Ceram. Soc. 76 (2), 518 (1993).CrossRefGoogle Scholar
31Machado, D. R., M. Sc. Thesis, Technion I.I.T., Haifa, Israel (1994).Google Scholar
32Masters, K., Spray Drying Handbook, 4th ed. (George Godwin, London, 1985), pp. 301, 307.Google Scholar
33Reid, R. C., Prausnitz, J. M., and Poling, B. E., The Properties of Gases & Liquids, 4th ed. (McGraw-Hill, New York, 1988), pp. 620, 624.Google Scholar