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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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