Kumar, M. and Arulraj, I. and Pattabiraman, R. (2008) Y2Zr2O7 (YZ)-pyrochlore based oxide as an electrolyte material for intermediate temperature solid oxide fuel cells (ITSOFCs)—Influence of Mn addition on YZ. Materials Chemistry and Physics, 108 (1). pp. 102-108. ISSN 0254-0584

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Abstract

Compositions in the pyrochlore system Y2Zr2O7 (YZ) and Y2Zr2−xMnxO7−δ (YZM) (where x = 0.025, 0.05, 0.075 and 0.10) were examined as possible alternatives to stabilised zirconia solid oxide electrolyte in intermediate temperature solid oxide fuel cells (ITSOFC). Such materials were prepared by glycine–nitrate combustion process. The prepared compounds were characterised by X-Ray Diffraction and Thermal analysis. Circular pellets were fabricated and annealed at different temperatures ranging from 1000 to 1400 ◦C. The sintering behaviour of YZ andYZMwere investigated to obtain information on the densification factor, relative percentage shrinkage/expansion in volume after heat treatment and apparent porosity value. The small doping level of Mn (≤10.0 wt%) resulted in increased conductivity values. The component diffusion coefficients and mobility of ions are calculated from its conductivity value. Dcomp and μi are found in the range of 10−8 cm2 s−1 and 10−7 cm2 V−1 s−1, respectively. The key features, which make the YZ and YZM systems attractive as a fuel cell electrolyte, are discussed.

Item Type:	Article
Uncontrolled Keywords:	Yttrium zirconate pyrochlore oxides; Combustion method; Sintering studies; Scanning electron microscope; Conductivity measurements
Subjects:	Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	01 Apr 2012 11:00
Last Modified:	01 Apr 2012 11:00
URI:	http://cecri.csircentral.net/id/eprint/417

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