Abstract
The difference in the diffusion coefficients in complex oxide cations during synthesis results in the formation of a solid solution of the oxide containing the cation with the lower diffusion coefficient in the complex oxide, and also the phase consisting of the oxide with the higher diffusion coefficient or enriched by this oxide. Using highly disperse powders, it is possible to identify the cation which is the most mobile in synthesis, based on the oxide remaining in the product. This is demonstrated on the example of lanthanum chromite synthesis using the sol-gel method. An account of the variation in the relationship between the diffusion rates of lanthanum and chromium cations depending on the synthesis temperature and the polyvinyl alcohol in the gel is provided.
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References
A. V. Belyakov, “The effect of the difference in cation diffusion rates on the deviation from stoichiometry in complex oxides,”Steklo Keram., No. 10, 18–20 (1997).
I. A. Zhigalkina, T. D. Nikolaeva, Yu. L. Suponitskii, and B. I. Polyak, “Synthesis of lanthanum chromite using the sol-gel method,”Steklo Keram. No. 6, 15–17 (1998).
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Translated from Steklo i Keramika, No. 7, pp. 22 – 23, July, 1999.
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Belyakov, A.V. Evaluation of the diffusion rate in solid-phase reactions of highly disperse oxides. Glass Ceram 56, 220–222 (1999). https://doi.org/10.1007/BF02681496
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DOI: https://doi.org/10.1007/BF02681496