Thermal and chemical expansion properties of La0.2Sr0.8Fe0.55Ti0.45O3-x

The thermal and chemical expansion coefficients for La0.2Sr0.8Fe0.55Ti0.45O3-x were measured at 800 < =T < =1200 deg C and at 1X10-15 < =pO2 < =0.21 atm. Measurements of the total expansion coefficient in air, on heating and cooling between room temperature and 1200 deg C, are reproducib...

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Bibliographic Details
Published in:Solid state ionics 2005-11, Vol.176 (35-36), p.2671-2676
Main Authors: Park, Chan Young, Jacobson, Allan J
Format: Article
Language:English
Online Access:Get full text
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Summary:The thermal and chemical expansion coefficients for La0.2Sr0.8Fe0.55Ti0.45O3-x were measured at 800 < =T < =1200 deg C and at 1X10-15 < =pO2 < =0.21 atm. Measurements of the total expansion coefficient in air, on heating and cooling between room temperature and 1200 deg C, are reproducible. The average thermal expansion coefficient of La0.2Sr0.8Fe0.55Ti0.45O3-x is 9.3+/-1.1X10-6 K-1 over the whole temperature range, similar to the values reported for other titanium substituted perovskites and yttria-stabilized zirconia. The chemical expansion coefficients measured at 800 deg C vary linearly with the degree of oxygen non-stoichiometry. At higher temperatures, the chemical expansion shows a pronounced non-linear dependence on stoichiometry. At oxygen partial pressures below 10-6 atm, the expansion shows evidence of the slow kinetic behavior previously observed in stoichiometry and conductivity measurements.
ISSN:0167-2738
DOI:10.1016/j.ssi.2005.08.003