Zahid, M. and Arulraj, I. and Fischer, W. and Tietz, F. and Serraalfaro, J.M. (2006) Synthesis and investigations on the stability of La0.8Sr0.2CuO2.4+δ at high temperatures. Solid State Ionics, 177. pp. 3205-3210. ISSN 0167-2738

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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.

Item Type:	Article
Uncontrolled Keywords:	Lanthanum cuprate; La0.8Sr0.2CuO2.4+δ; Phase transformation; Electrical conductivity; Thermal expansion
Subjects:	Fuel Cells
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	06 Apr 2012 15:26
Last Modified:	06 Apr 2012 15:26
URI:	http://cecri.csircentral.net/id/eprint/835

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