Structure and conductivity of strontium-doped cerium orthovanadates Ce{sub 1-x}Sr{sub x}VO{sub 4} (0{<=}x{<=}0.175)

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.03.032· OSTI ID:21421506

Petit, Christophe T.G.; Rong, Lan; Cowin, Peter I ^[1]; Tao, Shanwen ^[1]

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1. Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

A-site substituted cerium orthovanadates, Ce{sub 1-x}Sr{sub x}VO{sub 4}, were synthesised by solid-state reactions. It was found that the solid solution limit in Ce{sub 1-x}Sr{sub x}VO{sub 4} is at x=0.175. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4{sub 1}/amd (1 4 1) with a=7.3670 (3) and c=6.4894 (1) A for Ce{sub 0.825}Sr{sub 0.175}VO{sub 4}. The UV-vis absorption spectra indicated that the compounds have band gaps at room temperature in the range 4.5-4.6 eV. Conductivity measurements were performed for the first time up to the strontium solid solution limit in air and in dry 5% H{sub 2}/Ar with conductivity values at 600 {sup o}C ranging from 0.3 to 30 mS cm{sup -1} in air to 30-45 mS cm{sup -1} in reduced atmosphere. Sample Ce{sub 0.825}Sr{sub 0.175}VO{sub 4} is redox stable at a temperature below 600 {sup o}C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells. - Graphical abstract: A-site substituted cerium orthovanadates Ce{sub 1-x}Sr{sub x}VO{sub 4} were synthesised by solid state reaction and their conductivities measured in air and dry 5% H{sub 2}/Ar up to the strontium solid solution limit.

• OSTI ID: 21421506
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 6; Other Information: DOI: 10.1016/j.jssc.2010.03.032; PII: S0022-4596(10)00122-2; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
ARGON
CERIUM COMPOUNDS
DOPED MATERIALS
EV RANGE 01-10
HYDROGEN
SOLID OXIDE FUEL CELLS
SOLID SOLUTIONS
SPACE GROUPS
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
VANADATES
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DIRECT ENERGY CONVERTERS
DISPERSIONS
ELECTROCHEMICAL CELLS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
FUEL CELLS
GASES
HIGH-TEMPERATURE FUEL CELLS
HOMOGENEOUS MIXTURES
MATERIALS
MIXTURES
NONMETALS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RARE GASES
SCATTERING
SOLID ELECTROLYTE FUEL CELLS
SOLUTIONS
SPECTRA
SYMMETRY GROUPS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS