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Studies on strontium substituted rare earth manganites

Aruna, ST and Muthuraman, M and Patil, KC (1999) Studies on strontium substituted rare earth manganites. In: Solid State Ionics, 120 (1-4). pp. 275-280.

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Official URL: http://dx.doi.org/10.1016/S0167-2738(99)00021-1

Abstract

Sintering, electrical conductivity and thermal expansion behaviour of combustion synthesised strontium substituted rare earth manganites with the general formula Ln(1-x)Sr(x)MnO(3) (Ln = Pr, Nd and Sm; x = 0, 0.16 and 0.25) have been investigated as solid oxide fuel cell cathode materials. The combustion derived rare earth manganites have surface area in the range of 13-40 m(2)/g. Strontium substitution increases the electrical conductivity values in all the rare earth manganites. With the decreasing ionic radii of rare earth ions, the conductivity value decreases. Among the rare earth manganites studied, (Pr/Nd)(0.75)Sr0.25MnO3 show high electrical conductivity ( > 100 S/cm). The thermal expansion coefficients of Pr0.75Sr0.25MnO3 and Nd0.75Sr0.25MnO3 were found to be 10.2 x 10(-6) and 10.7 x 10(-6) K-1 respectively, which is very close to that of the electrolyte (YSZ) used in solid oxide fuel cells. (C) 1999 Elsevier Science B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Cathode materials;SOFC;Manganites;Electrical conductivity; Thermal expansion
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 30 Jun 2011 07:21
Last Modified: 30 Jun 2011 07:21
URI: http://eprints.iisc.ernet.in/id/eprint/38811

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