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Synthesis of LaFeO3 perovskite-type oxide via solid-state combustion of a cyano complex precursor: The effect of oxygen diffusion

The effect of oxygen diffusion on the thermal decomposition kinetics of La[Fe(CN)6]·5H2O has been explored. In particular, the critical conditions under which LaFeO3 can be synthesized via solid-state combustion of this cyano complex precursor were analytically and numerically investigated. Thermal analysis experiments as well as simulations showed that the oxygen diffusion enhancement facilitates the formation of a self-propagating combustion front during the decomposition of La[Fe(CN)6]·5H2O. As a consequence, the sample undergoes local overheating that raises its temperature by several hundreds of degrees. This enables the production of LaFeO3 perovskite-type oxide with a minimum contribution of external heat resources. Although the self-propagating high-temperature method has already proven to be successful for the synthesis of perovskite-type oxides from cyano complex precursors under oxygen atmosphere, we will show that under the appropriate settings, air can be used instead. Moreover, the temperature of the front is related to the ease of oxygen diffusion. Therefore, the surface area and the crystal size of LaFeO3 perovskite-type powders obtained via solid state combustion have been controlled by controlling the gas flow rate at which the sample has been exposed during the treatment

© Ceramics International, 2017, vol. 43, núm. 3, p. 3156-3165

Elsevier

Author: Sánchez-Rodríguez, Daniel
Wada, Hiroki
Yamaguchi, Syuhei
Farjas Silva, Jordi
Yahiro, Hidenori
Date: 2017 February 15
Abstract: The effect of oxygen diffusion on the thermal decomposition kinetics of La[Fe(CN)6]·5H2O has been explored. In particular, the critical conditions under which LaFeO3 can be synthesized via solid-state combustion of this cyano complex precursor were analytically and numerically investigated. Thermal analysis experiments as well as simulations showed that the oxygen diffusion enhancement facilitates the formation of a self-propagating combustion front during the decomposition of La[Fe(CN)6]·5H2O. As a consequence, the sample undergoes local overheating that raises its temperature by several hundreds of degrees. This enables the production of LaFeO3 perovskite-type oxide with a minimum contribution of external heat resources. Although the self-propagating high-temperature method has already proven to be successful for the synthesis of perovskite-type oxides from cyano complex precursors under oxygen atmosphere, we will show that under the appropriate settings, air can be used instead. Moreover, the temperature of the front is related to the ease of oxygen diffusion. Therefore, the surface area and the crystal size of LaFeO3 perovskite-type powders obtained via solid state combustion have been controlled by controlling the gas flow rate at which the sample has been exposed during the treatment
Format: application/pdf
Citation: https://doi.org/10.1016/j.ceramint.2016.11.134
ISSN: 0272-8842
Document access: http://hdl.handle.net/10256/13444
Language: eng
Publisher: Elsevier
Collection: Versió postprint del document publicat a: https://doi.org/10.1016/j.ceramint.2016.11.134
Articles publicats (D-F)
Is part of: © Ceramics International, 2017, vol. 43, núm. 3, p. 3156-3165
Rights: Tots els drets reservats
Subject: Compostos metàl·lics -- Síntesi
Metallic composites -- Synthesis
Title: Synthesis of LaFeO3 perovskite-type oxide via solid-state combustion of a cyano complex precursor: The effect of oxygen diffusion
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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