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Vol. 29 No. 10 (2017): Vol 29 Issue 10

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Thermal Expansion, Microhardness and Oxygen Permeation of La1-xSrxCo0.8Fe0.2O3+d Membranes

https://doi.org/10.14233/ajchem.2017.20681
A. Aliyatulmuna
Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia; Department of Chemistry, Universitas Negeri Malang (UM), Jalan Semarang 5, Malang 65145, Indonesia
W.P. Utomo
Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia
R.Y.P. Burhan
Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia
H. Fansuri
Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia
I.K. Murwani
Department of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, Surabaya 60111, Indonesia

Corresponding Author(s) : H. Fansuri

h.fansuri@chem.its.ac.id

Asian Journal of Chemistry, Vol. 29 No. 10 (2017): Vol 29 Issue 10

Abstract

Dense ceramic membranes acting as oxygen and electron ion-conductors can be used as the catalysts for syngas production. The La1-xSrxCo0.8Fe0.2O3+d (LSCF) systems were known to have a high ionic and electronic conductivity. In the application, the La1-xSrxCo0.8Fe0.2O3+d membranes required low thermal expansion, microhardness and high oxygen permeation flux. The changes in the expansion, hardness, and oxygen flux of the La1-xSrxCo0.8Fe0.2O3+d perovskite membranes with various strontium substitutions were studied. The magnitude of both the thermal expansion and the oxygen content of the La1-xSrxCo0.8Fe0.2O3+d membranes decreased with up to 20 % strontium substitution and then increased with 30 and 40 % strontium ion substitution. Meanwhile, the hardness and shrinkage improved by various strontium ion substitutions, except with 20 % strontium. The highest oxygen flux over La1-xSrxCo0.8Fe0.2O3+d (0.0 £ x £ 0.4) membranes in the surface exchange-controlled processes was found of the membrane with 30 % strontium substitution.

Keywords

Oxygen flux Oxygen Non-stoichiometry Shrinkage
Aliyatulmuna, A., Utomo, W., Burhan, R., Fansuri, H., & Murwani, I. (2017). Thermal Expansion, Microhardness and Oxygen Permeation of La1-xSrxCo0.8Fe0.2O3+d Membranes. Asian Journal of Chemistry, 29(10), 2191–2196. https://doi.org/10.14233/ajchem.2017.20681
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