Preparation of gas-tight strontium-doped lanthanum cobaltate by an aqueous sol-gel process

C.H. Chen; H. Kruidhof; H.J.M. Bouwmeester; A.J. Burggraaf

doi:10.1016/0921-5107(96)01582-6

Preparation of gas-tight strontium-doped lanthanum cobaltate by an aqueous sol-gel process

C.H. Chen^*, H. Kruidhof, H.J.M. Bouwmeester, A.J. Burggraaf

^*Corresponding author for this work

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Abstract

Gas-tight dense membranes of highly Sr-doped LaCoO3 (such as the composition La0.3Sr0.7CoO3 chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as a homogeneous powder after heat treatment. Thermal analysis and XRD show the presence of SrCO3 and La2O3 when the heat treatment temperature of the xerogel is lower than 950 °C. Single phase of cubic perovskite La0.3Sr0.7CoO3 can be obtained after treatment at above 1000 °C. Sintering the cold pressed green compact at above 1100 °C may result in gas-tight samples. It is found that the sintering temperature has a minor influence on the oxygen permeability of a gas-tight membrane.

Original language	English
Pages (from-to)	129-132
Number of pages	4
Journal	Materials science & engineering
Volume	B39
Issue number	2
DOIs	https://doi.org/10.1016/0921-5107(96)01582-6
Publication status	Published - 1996

Keywords

Lanthanum cobaltate
Sol-gel
Dense membrane

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title = "Preparation of gas-tight strontium-doped lanthanum cobaltate by an aqueous sol-gel process",

abstract = "Gas-tight dense membranes of highly Sr-doped LaCoO3 (such as the composition La0.3Sr0.7CoO3 chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as a homogeneous powder after heat treatment. Thermal analysis and XRD show the presence of SrCO3 and La2O3 when the heat treatment temperature of the xerogel is lower than 950 °C. Single phase of cubic perovskite La0.3Sr0.7CoO3 can be obtained after treatment at above 1000 °C. Sintering the cold pressed green compact at above 1100 °C may result in gas-tight samples. It is found that the sintering temperature has a minor influence on the oxygen permeability of a gas-tight membrane.",

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AU - Chen, C.H.

AU - Kruidhof, H.

AU - Bouwmeester, H.J.M.

AU - Burggraaf, A.J.

PY - 1996

Y1 - 1996

N2 - Gas-tight dense membranes of highly Sr-doped LaCoO3 (such as the composition La0.3Sr0.7CoO3 chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as a homogeneous powder after heat treatment. Thermal analysis and XRD show the presence of SrCO3 and La2O3 when the heat treatment temperature of the xerogel is lower than 950 °C. Single phase of cubic perovskite La0.3Sr0.7CoO3 can be obtained after treatment at above 1000 °C. Sintering the cold pressed green compact at above 1100 °C may result in gas-tight samples. It is found that the sintering temperature has a minor influence on the oxygen permeability of a gas-tight membrane.

AB - Gas-tight dense membranes of highly Sr-doped LaCoO3 (such as the composition La0.3Sr0.7CoO3 chosen in this study) are difficult to prepare using usual synthesis processes. This report presents an aqueous sol-gel route using metal acetates as precursors to achieve this goal. Hydrogen peroxide and ammonia are added to the acetates precursor solution to obtain stable sol and xerogel, as well as a homogeneous powder after heat treatment. Thermal analysis and XRD show the presence of SrCO3 and La2O3 when the heat treatment temperature of the xerogel is lower than 950 °C. Single phase of cubic perovskite La0.3Sr0.7CoO3 can be obtained after treatment at above 1000 °C. Sintering the cold pressed green compact at above 1100 °C may result in gas-tight samples. It is found that the sintering temperature has a minor influence on the oxygen permeability of a gas-tight membrane.

KW - Lanthanum cobaltate

KW - Sol-gel

KW - Dense membrane

U2 - 10.1016/0921-5107(96)01582-6

DO - 10.1016/0921-5107(96)01582-6

M3 - Article

SN - 0025-5416

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JO - Materials science & engineering

JF - Materials science & engineering

IS - 2

ER -

Preparation of gas-tight strontium-doped lanthanum cobaltate by an aqueous sol-gel process

Abstract

Keywords

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