Tietz, F. and Arulraj, I. and Fu, Q.X. and Zahid, M. (2009) Investigation of the quasi-ternary system LaMnO3–LaCoO3– ‘‘LaCuO3’’. II: The series LaMn0.252xCo0.752xCu2xO32d and LaMn0.752xCo0.252xCu2xO32d. Journal of Materials Science, 44 (14). pp. 4883-4891. ISSN 0022-2461

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Abstract

This paper investigates the crystal structure, thermal expansion, and electrical conductivity of two series of perovskites (LaMn0.25-xCo0.75-xCu2xO3-d and La Mn0.75-xCo0.25-xCu2xO3-d with x = 0, 0.025, 0.05, 0.1, 0.15, 0.2, and 0.25) in the quasi-ternary system LaMnO3– LaCoO3–‘‘LaCuO3’’. The Mn/Co ratio was found to have a stronger influence on these properties than the Cu content. In comparison to the Co-rich series (LaMn0.25-xCo0.75-xCu2x O3-d), the Mn-rich series (LaMn0.75-xCo0.25-xCu2xO3-d) showed a much higher Cu solubility. All compositions in this series were single-phase materials after calcination at 1100 �C. The Co-rich series showed higher thermal expansion coefficients (amax = 19.6 9 10-6 K-1) and electrical conductivity (rmax = 730 S/cm at 800 �C) than the Mnrich series (amax = 10.6 9 10-6 K-1, rmax = 94 S/cm at 800 �C). Irregularities in the thermal expansion curves indicated phase transitions at 150–350 �C for the Mn-rich series, while partial melting occurred at 980–1000 �C for the Co-rich series with x[0.15.

Item Type:	Article
Subjects:	Fuel Cells Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	01 Apr 2012 17:54
Last Modified:	01 Apr 2012 17:54
URI:	http://cecri.csircentral.net/id/eprint/509

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