کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1295422 | 1498400 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and investigations on the stability of La0.8Sr0.2CuO2.4+δ at high temperatures Synthesis and investigations on the stability of La0.8Sr0.2CuO2.4+δ at high temperatures](/preview/png/1295422.png)
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.
Journal: Solid State Ionics - Volume 177, Issues 35–36, 30 November 2006, Pages 3205–3210