Characterization of the electrical properties of Y2O3-doped CeO2-rich CeO2–ZrO2 solid solutions

Lee, J.-H; Kim, J; Kim, S.-W; Lee, H.-W; Song, Hyun Hoon

doi:10.1016/j.ssi.2003.10.001

Cited by 28 publications

(7 citation statements)

References 21 publications

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“…[21][22][23] As well shown by Chiodelli et al, 24 Lee et al 25 and Kuhn et al, 26 defect chemical modelling is essential for the fundamental understanding of the OSC and for further improvement. The solid solution system CeO 2 -ZrO 2 -Y 2 O 3 has already been examined in polycrystalline form with regard to total conductivity, 25,[27][28][29][30][31][32][33] partial electronic conductivity 34 and nonstoichiometry 26,35 as a function of temperature and oxygen partial pressure. Reviewing these studies, three questions remain open: (a) it was observed by Cales and Baumard, 31 Lee et al 32 and Xiong et al 34 that the course of the total and the partial electronic conductivity as a function of oxygen partial pressure deviates strongly from the ''classical'' point defect model for acceptor doping (see Section 2), especially at low pO 2 .…”

Section: +mentioning

confidence: 99%

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions

Eufinger

Daniels

Schmale

et al. 2014

Phys. Chem. Chem. Phys.

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The ternary solid solution CeO 2 -ZrO 2 is known for its superior performance as an oxygen storage catalyst in exhaust gas catalysis (e.g. TWC), although the defect chemical background of these outstanding properties is not fully understood quantitatively. Here, a comprehensive experimental study is reported regarding defects and defect-related transport properties of cubic stabilized single crystalline (Ce x Zr 1Àx ) 0.8 Y 0.2 O 1.9Àd (0 r x r 1) solid solutions as a model system for CeO 2 -ZrO 2 . The constant fraction of yttria was chosen in order to fix a defined concentration of oxygen vacancies and to stabilize the cubic fluorite-type lattice for all Ce/Zr ratios. Measurements of the total electrical conductivity, the partial electronic conductivity, the ionic transference number and the non-stoichiometry (oxygen deficiency, oxygen storage capacity) were performed in the oxygen partial pressure range À25 o lg pO 2 /bar o 0 and for temperatures between 500 1C and 750 1C. The total conductivity at low pO 2 is dominated by electronic transport.A strong deviation from the widely accepted ideal solution based point defect model was observed.An extended point defect model was developed using defect activities rather than concentrations in order to describe the point defect reactions in CeO 2 -ZrO 2 -Y 2 O 3 properly. It served to obtain good quantitative agreement with the measured data. By a combination of values for non-stoichiometries and for electronic conductivities, the electron mobility could be calculated as a function of pO 2 , ranging between 10 À2 cm 2 V À1 s À1 and 10 À5 cm 2 V À1 s À1. Finally, the origin of the high oxygen storage capacity and superior catalytic promotion performance at a specific ratio of n(Ce)/n(Zr) E 1 was attributed to two main factors: (1) a strongly enhanced electronic conductivity in the high and medium pO 2 range qualifies the material to be a good mixed conductor, which is essential for a fast oxygen exchange and (2) the equilibrium constant for the reduction exhibits a maximum, which means that the reduction is thermodynamically most favoured just at this composition.

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Section: +mentioning

confidence: 99%

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions

Eufinger

Daniels

Schmale

et al. 2014

Phys. Chem. Chem. Phys.

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“…To our knowledge, it has never been reported that fully dense cubic ZrO 2 (FSZ) can be obtained with only 5.0 mol% stabilizer after only 2 h of pressureless sintering in air at 1450 • C. In the binary Y 2 O 3 -ZrO 2 system, 8.0 mol% co-precipitated dopant and a long heat-treatment at higher temperature 17 are needed to form dense cubic ZrO 2 , whereas 20 mol% co-precipitated CeO 2 is needed to obtain FSZ material in the CeO 2 -ZrO 2 system. 4,18 SEM micrographs of the thermally etched (20 min at 1300 • C) ceramics with different Yb 2 O 3 content and sintered at various conditions are shown in Figs. 4-6.…”

Section: Phase Assemblages and Microstructurementioning

confidence: 99%

“…[4][5][6] Pure zirconia has three polymorphs: monoclinic (m), tetragonal (t) and cubic (c). The transformation between different polymorphs is very important for the processing and mechanical properties of zirconia ceramics.…”

Section: Introductionmentioning

confidence: 99%

Yb2O3 and Y2O3 co-doped zirconia ceramics

Kan

Zhang

Wang

et al. 2006

Journal of the European Ceramic Society

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“…CeO 2 doped with rare-earth ions exhibits high oxide ion conductivity at a relatively low temperature (about 600°C) and thus has been applied in solid oxide fuel cells [21,22]. In case of rare-earth-doped CeO 2 , the Y 2 O 3 (YDC) system has been studied due its relatively high electrical conductivity and the relative abundance of the yttrium element.…”

Section: +mentioning

confidence: 99%

Measurement of the Electrical Resistivity for Unconventional Structures

Pîslaru‐Dănescu¹,

Constantin²

2017

Electrical Resistivity and Conductivity

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This study presents an apparatus for the measurement of the electrical volume resistivity of concrete structures in civil and industrial constructions in 2.5 accuracy class, which operates at 500 Hz, for measuring the in situ resistivity of concrete in the range of 5-100 Ωm that is immune to errors due to the polarization phenomena at the interface probe/concrete sample. Also, a quench protection active system (QPS), which works in tandem with a superconducting coil structures (SCSs), in order to prevent the damaging effects when the coil structures pass from the superconducting state into normal conduction state (quench), is presented. An SCS made of YBCO tape high-temperature superconductor (HTS) type, with a critical temperature of 92 K, has been experimented. In order to minimize the heat transfer influx by convection, the SCSs are confined to a cryostat, which is vacuumed at about 0.001 mbar. The working temperature of the HTS coil structures is about 77 K, ensured by liquid nitrogen as cryogenic agent. Finally, the measurement of the electrical resistance of the sensing element (SE) as part of the resistive-type gas sensor is shown. The SE is placed on a Wheatstone bridge. The electrical resistance of the SE is variable by an amount ΔR, on when all the resistances of a Wheatstone bridge are nominally equal.

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Characterization of the electrical properties of Y2O3-doped CeO2-rich CeO2–ZrO2 solid solutions

Cited by 28 publications

References 21 publications

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions

Yb2O3 and Y2O3 co-doped zirconia ceramics

Measurement of the Electrical Resistivity for Unconventional Structures

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Characterization of the electrical properties of Y2O3-doped CeO2-rich CeO2–ZrO2 solid solutions

Cited by 28 publications

References 21 publications

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO2–ZrO2–Y2O3solid solutions

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO2–ZrO2–Y2O3solid solutions

Yb2O3 and Y2O3 co-doped zirconia ceramics

Measurement of the Electrical Resistivity for Unconventional Structures

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The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions

The model case of an oxygen storage catalyst – non-stoichiometry, point defects and electrical conductivity of single crystalline CeO₂–ZrO₂–Y₂O₃solid solutions