Kinetic demixing of ceramics in an electrical field

Monceau, Daniel; Filal, M.; Tebtoub, M.; Petot, C.; Petot-Ervas, G.

doi:10.1016/0167-2738(94)90037-x

Cited by 57 publications

(38 citation statements)

References 9 publications

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“…Most investigations reported in the literature deal with semiconducting oxides, such as CoxNil_xO, CoxMg~_~O and CO~_xGa~O, for example [17,27]. As an example, (Fig.…”

Section: Kinetic Demixing In Semiconducting Oxidesmentioning

confidence: 99%

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Ageing of solid electrolytes and electrode materials in electrochemical devices

Petot-Ervas

Petot

1998

Ionics

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Abstract. The ageing behavior reported in this work concerns the consequences of the matter transport processes on the cationic sublattice which occur in solid electrolytes, mixed ionic conducting compounds and semiconducting oxides subjected to a chemical potential gradient, an applied electrical field or a mechanical stress gradient. The principle of the kinetic demixing under a "generalized" thermodynamic potential gradient is reviewed. Available experimental results concerning yttria-doped zirconia and iono-covalent oxides are reported. The results are discussed in relation with the microstructure and composition evolution of the surfaces and the electrode resistance.

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“…Most investigations reported in the literature deal with semiconducting oxides, such as CoxNil_xO, CoxMg~_~O and CO~_xGa~O, for example [17,27]. As an example, (Fig.…”

Section: Kinetic Demixing In Semiconducting Oxidesmentioning

confidence: 99%

“…Calculations have also been performed [17] moved and the surface shows important perturbations in some places. It should be noted that the anode corresponds to the unstable surface [14].…”

Section: Kinetic Demixing In Semiconducting Oxidesmentioning

confidence: 99%

Ageing of solid electrolytes and electrode materials in electrochemical devices

Petot-Ervas

Petot

1998

Ionics

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“…Monceau et al [18] performed a quantitative formulation of the kinetic demixing problem in an electrical potential gradient and presented the results of demixing experiments for a (Co,Mg)O solid solution. Systematic theoretical and experimental studies of demixing of homovalent oxide solid solutions and heterovalently doped oxides in an electric potential gradient were performed by Teller and Martin [19][20][21].…”

Section: Materials In Thermodynamic Potential Gradients 893mentioning

confidence: 99%

Materials in thermodynamic potential gradients

Martin

2003

The Journal of Chemical Thermodynamics

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In materials that are exposed to thermodynamic potential gradients (i.e., gradients of chemical potentials, electrical potential, temperature, or pressure), transport processes of the mobile components occur. These transport processes and the coupling between different processes are not only of fundamental interest, but are also the origin of degradation processes, such as kinetic demixing and decomposition and changes in the morphology of the material, all of which are of great practical relevance. Two classes of materials will be considered: semi-and ion-conducting oxides and ion-conducting halides. In oxides, kinetic demixing of the cations in a multicomponent oxide and kinetic decomposition of the oxide under the influence of an applied thermodynamic potential gradient will be considered for homovalent oxide solid solutions and for heterovalently doped oxides. In ion-conducting halides, the morphological stability of solid/solid interfaces, which are driven by an external electrical potential gradient, is studied. Monte Carlo simulations show that the morphological stability of the interface is determined by the difference in the ionic conductivities of the two crystals.

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“…Under working conditions, these materials are often exposed to external forces causing both reactions and transport within the materials. Prominent examples are electromigration or kinetic demixing in electric fields [1][2][3][4][5], kinetic demixing in chemical potential gradients [6][7][8][9], stress-driven segregation [10,11] or thermodiffusion ( [12][13][14][15][16][17][18][19][20], see [21,22] for reviews).…”

Section: Introductionmentioning

confidence: 99%

On the Soret effect in binary nonstoichiometric oxides—kinetic demixing of cuprite in a temperature gradient

Timm

Janek

2005

Solid State Ionics

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The Soret effect in nonstoichiometric copper(I)-oxide (cuprite, Cu 2Àd O) has been studied experimentally by means of non-isothermal solid state galvanic cells (thermocells) under different boundary conditions. At high temperatures and high oxygen activities, copper metal migrates down the temperature gradient and a gradient in the nonstoichiometry is established under stationary conditions. The heat of transport of copper metal is determined as Q* Cu c180 kJ/mol at a temperature of 1000 8C and at an oxygen activity of log a O 2 =À2.95. This result agrees with recent theoretical simulations of the heat of transport of atoms migrating via a vacancy mechanism. These predict a positive sign of the heat of transport and a considerably larger value than the activation energy for the atomic jumps. D

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Kinetic demixing of ceramics in an electrical field

Cited by 57 publications

References 9 publications

Ageing of solid electrolytes and electrode materials in electrochemical devices

Ageing of solid electrolytes and electrode materials in electrochemical devices

Materials in thermodynamic potential gradients

On the Soret effect in binary nonstoichiometric oxides—kinetic demixing of cuprite in a temperature gradient

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