Synthesis and investigations on the stability of La0.8Sr0.2CuO2.4+δ at high temperatures |
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Affiliation: | 1. Forschungszentrum Jülich, Institute of Energy Research (IEF-1), D-52425 Jülich, Germany;2. Central Electrochemical Research Institute, Karaikudi- 630006, India;1. Institute of Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania;2. Alexandru Ioan Cuza University, Faculty of Physics, 11 Carol I Blvd, 7000506 Iasi, Romania;1. Institute of Physics, National Academy of Sciences of Ukraine, 46, Nauka Ave., Kyiv 03680, Ukraine;2. Institute of Physics, Polish Academy of Sciences, 32/46, Al. Lotników, PL-02-668 Warsaw, Poland |
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Abstract: | For application in solid oxide fuel cells La0.8Sr0.2CuO2.4+δ was synthesized and the phase evolution was characterized after quenching from different temperatures and after slow cooling. A single phase perovskite was found after quenching from 950 °C. The electrical conductivity of the La0.8Sr0.2CuO2.4+δ perovskite exhibited metallic behavior reaching values of about 270 S/cm at 800 °C in air. The thermal expansion between 30 and 800 °C gave a thermal expansion coefficient of 11.1 × 10− 6 K− 1.At higher temperatures, the perovskite was transformed to the K2NiF4-type structure via an intermediate stage that can be best described as a LaSrCuO4 phase with preferential growing of {020} lattice planes. After sintering at 1100 °C and slow cooling in the furnace a phase mixture of (La,Sr)CuO4+δ and (La,Sr)CuO2.4+δ perovskite was obtained. This phase mixture showed higher electrical conductivity (400 S/cm at 800 °C) and smaller thermal expansion coefficient (9.6 × 10− 6 K− 1) than the single phase La0.8Sr0.2CuO2.4+δ perovskite. |
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