IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
Effect of Sr Substitution on the Physical Properties of La1-xSrxMnO3
Toshio MatsushimaHimeko OhruiToshiro Hirai
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1998 Volume 118 Issue 3 Pages 308-314

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Abstract
The relationship between the amount of Sr substitution (x) and the physical properties of La1-xSrxMnO3, usually used for Solid Oxide Fuel Cell cathodes, was studied. Conductivity increased with an increase in the amount of Sr, and was almost constant in the range of x≥0.4. Bending strength increased in proportion to the density of the body in the range of 0.1≤x≤0.3, and decreased above that range. Thermal expansion was influenced not only by x but also by the sintering temperature. Samples sintered at 1200°C with x≤0.2 show a point of inflection caused by the phase transition at around 800°C, while samples with x≥0.3 have linear characteristics in the temperature range under 1000°C, when the sintering temperature was over 1300°C. XRD analysis showed orthorhombic structure material in the samples with 0.1≤x≤0.3 sintered at 1500°C, which have high bending strength. This material is thought to have some relationship to the increase in the bending strength of La1-xSrxMnO3. As a result, it was indicated that Sr substitution x=0.2_??_0.3 is adequate for cathode material in Solid Oxide Fuel Cells.
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