Structure, conductivity and redox stability of solid solution Ce1-xCaxVO4 (0 0.4125)

Christophe T. G. Petit, Rong Lan, Peter I. Cowin, Arno Kraft, Shanwen Tao

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A-site-substituted cerium orthovanadates, Ce1-x CaxVO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-xCaxVO4 series is at x = 0.4125. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4(1)/amd with a = 7.4004 (1) and c = 6.4983 (6) angstrom for CeVO4. The UV-Visible absorption spectra indicated that the compounds have band gaps at room temperature in the range of 4.2-4.5 eV. Conductivity measurements were performed for the first time up to the calcium solid solution limit in both air and dry 5% H-2/Ar with conductivity values at 600 degrees C ranging from 0.3 to 20 mS cm(-1) in air to 3 to 30 mS cm(-1) in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H-2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1 VO4 and Ce0.8Ca0.2VO4 are redox stable at a temperature below 600 degrees C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells.

LanguageEnglish
Pages316-326
Number of pages11
JournalJournal of Materials Science
Volume46
Issue number2
DOIs
Publication statusPublished - Jan 2011

Fingerprint

Solid solutions
Air
Cerium
Zircon
Earth atmosphere
Vanadates
Electrochemical cells
Solid oxide fuel cells (SOFC)
Solid state reactions
Temperature
Absorption spectra
Calcium
Energy gap
Crystal structure
X ray diffraction
Electrodes
Oxidation-Reduction

Keywords

  • crystak structure
  • CA
  • SR
  • orthovanadate
  • transport
  • vanadates
  • behavior
  • oxides
  • TB
  • YB

Cite this

Petit, Christophe T. G. ; Lan, Rong ; Cowin, Peter I. ; Kraft, Arno ; Tao, Shanwen. / Structure, conductivity and redox stability of solid solution Ce1-xCaxVO4 (0 0.4125). In: Journal of Materials Science. 2011 ; Vol. 46, No. 2. pp. 316-326.
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abstract = "A-site-substituted cerium orthovanadates, Ce1-x CaxVO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-xCaxVO4 series is at x = 0.4125. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4(1)/amd with a = 7.4004 (1) and c = 6.4983 (6) angstrom for CeVO4. The UV-Visible absorption spectra indicated that the compounds have band gaps at room temperature in the range of 4.2-4.5 eV. Conductivity measurements were performed for the first time up to the calcium solid solution limit in both air and dry 5{\%} H-2/Ar with conductivity values at 600 degrees C ranging from 0.3 to 20 mS cm(-1) in air to 3 to 30 mS cm(-1) in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H-2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1 VO4 and Ce0.8Ca0.2VO4 are redox stable at a temperature below 600 degrees C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells.",
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Structure, conductivity and redox stability of solid solution Ce1-xCaxVO4 (0 0.4125). / Petit, Christophe T. G.; Lan, Rong; Cowin, Peter I.; Kraft, Arno; Tao, Shanwen.

In: Journal of Materials Science, Vol. 46, No. 2, 01.2011, p. 316-326.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structure, conductivity and redox stability of solid solution Ce1-xCaxVO4 (0 0.4125)

AU - Petit, Christophe T. G.

AU - Lan, Rong

AU - Cowin, Peter I.

AU - Kraft, Arno

AU - Tao, Shanwen

PY - 2011/1

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N2 - A-site-substituted cerium orthovanadates, Ce1-x CaxVO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-xCaxVO4 series is at x = 0.4125. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4(1)/amd with a = 7.4004 (1) and c = 6.4983 (6) angstrom for CeVO4. The UV-Visible absorption spectra indicated that the compounds have band gaps at room temperature in the range of 4.2-4.5 eV. Conductivity measurements were performed for the first time up to the calcium solid solution limit in both air and dry 5% H-2/Ar with conductivity values at 600 degrees C ranging from 0.3 to 20 mS cm(-1) in air to 3 to 30 mS cm(-1) in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H-2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1 VO4 and Ce0.8Ca0.2VO4 are redox stable at a temperature below 600 degrees C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells.

AB - A-site-substituted cerium orthovanadates, Ce1-x CaxVO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-xCaxVO4 series is at x = 0.4125. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4(1)/amd with a = 7.4004 (1) and c = 6.4983 (6) angstrom for CeVO4. The UV-Visible absorption spectra indicated that the compounds have band gaps at room temperature in the range of 4.2-4.5 eV. Conductivity measurements were performed for the first time up to the calcium solid solution limit in both air and dry 5% H-2/Ar with conductivity values at 600 degrees C ranging from 0.3 to 20 mS cm(-1) in air to 3 to 30 mS cm(-1) in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H-2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1 VO4 and Ce0.8Ca0.2VO4 are redox stable at a temperature below 600 degrees C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells.

KW - crystak structure

KW - CA

KW - SR

KW - orthovanadate

KW - transport

KW - vanadates

KW - behavior

KW - oxides

KW - TB

KW - YB

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