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Coprecipitation synthesis of doped lanthanum chromite

Published online by Cambridge University Press:  03 March 2011

M.R. De Guire ,
S.E. Dorris ,
R.B. Poeppel ,
S. Morissette  and
U. Balachandran
M.R. De Guire
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7204
S.E. Dorris
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
R.B. Poeppel
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
S. Morissette
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
U. Balachandran
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Two coprecipitation methods were used to synthesize powder precursors of doped lanthanum chromite (La, Ca)(Cr, Co)O3. The effects of synthesis method and calcination temperature on the composition, sintered density, and microstructure of pressed compacts of (La, Ca)(Cr, Co)O3 were studied by differential thermal analysis/thermogravimetric analysis, x-ray diffraction, scanning electron microscopy, and density measurement. The cation ratios in the precipitated solids were, with few exceptions, within experimental error of the desired compositions for all four components. Powders obtained by both techniques could be sintered to densities exceeding 93% at 1400 °C. The highest densities were obtained with calcining temperatures from 450 to 700 °C. The sintered microstructures exhibited uniform grain sizes averaging 3–5 μm. The Cr(vi) compounds, CaCrO4 and La2CrO6, were observed in all of the calcined powders. The possible role of these phases on chromite densification is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 9 , September 1993 , pp. 2327 - 2335
Copyright
Copyright © Materials Research Society 1993

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References

REFERENCES

1Pechini, M. P., U. S. Patent No. 3330697, July 11, 1967.Google Scholar
2Lessing, P. A., Am. Ceram. Soc. Bull. 68, 1002 (1989).Google Scholar
3Johnson, D. W., Am. Ceram. Soc. Bull. 64, 1597 (1985).Google Scholar
4Reed, J. S., Introduction to the Principles of Ceramic Processing (John Wiley & Sons, New York, 1988), pp. 48–51.Google Scholar
5Pathak, A., Mukhopadhyay, D. K., and Pramanik, P., Mater. Res. Bull. XXVII, 155 (1992).Google Scholar
6Kayser, M. H., Borglum, B., Antony, G., Shyu, S. G., and Buchanan, R. C., in High-Temperature Superconductors, edited by Brodsky, M. B., Dynes, R. C., Kitazawa, K., and Tuller, H. L. (Mater. Res. Soc. Symp. Proc. 99, Pittsburgh, PA, 1988), pp. 159–164.Google Scholar
7De Guire, M. R. and Philipp, W. B., unpublished results.Google Scholar
8Cotton, F. A. and Wilkinson, G., Advanced Inorganic Chemistry, 5th ed. (John Wiley & Sons, New York, 1988), p. 683.Google Scholar
9CRC Handbook of Chemistry and Physics, 60th ed., edited by Weast, R.C. (CRC Press, Boca Raton, FL, 1979).Google Scholar
10Ferguson, D. E., Dean, O. C., and Douglas, D. A., Intl. Conf. Peaceful Uses of Atomic Energy Proc. 10, 307 (1965).Google Scholar
11Takahashi, J., Ikegami, T., and Kogeyama, K., J. Am. Ceram. Soc. 74, 1868 (1991).CrossRefGoogle Scholar
12Golub, A. M., Nedilko, S. A., and Antishko, A. N., Inorg. Mater.(Engl. Transl.) 10, 1431 (1974); as cited in Phase Diagrams for Ceramists (American Ceramic Society, Westerville, OH, 1981), Vol. 5, Fig. 5490.Google Scholar
13Morissette, S., Argonne National Laboratory, unpublished results.Google Scholar
14Gordon, C. L., J. Res. Natl. Bur. Stand. 30, 107 (1943); Wickers, E., Schlecht, W. G., and Gordon, C. L., J. Res. Natl. Bur. Stand. 33, 364 (1944); Wickers, E., Schlecht, W. G., and Gordon, C. L., J. Res. Natl. Bur. Stand. 33, 451 (1944); Gordon, C.L., Schlecht, W. G., and Wickers, E., J. Res. Natl. Bur. Stand. 33, 457 (1944).Google Scholar
15JCPDS Powder Diffraction File (Joint Committee on Powder Diffraction Standards, Swarthmore, PA), Nos. 8-458 and 26-817.Google Scholar
16Ford, W. F. and White, J., Trans. Br. Ceramic Society 48, 423 (1949); as cited in Phase Diagrams for Ceramists (American Ceramic Society, Westerville, OH, 1981), Vol. 1, Fig. 39.Google Scholar
17Phase Diagrams for Ceramists (American Ceramic Society, Westerville, OH, 1975), Vol. 3, Fig. 4397.Google Scholar
18Berjoan, R., Rev. Int. Hautes Temp. Refract. 13, 119 (1976); as cited in Phase Diagrams for Ceramists (American Ceramic Society, Westerville, OH, 1981), Vol. 4, Fig. 5202.Google Scholar
19JCPDS Powder Diffraction File (Joint Committee on Powder Diffraction Standards, Swarthmore, PA), Nos. 24-1016 and 33-701.Google Scholar
20Chick, L. A., Bates, J. L., and Maupin, G. D., presented at the 2nd Int. Symp. Solid Oxide Fuel Cells, July 2–5, 1991, Athens, Greece.Google Scholar