Instability of Moving Interfaces between Ionic Crystals KCl/AgCl

Schimschal‐Thölke, S.; Schmalzried, H.; Martin, Manfred

doi:10.1002/bbpc.19950990102

Cited by 11 publications

(14 citation statements)

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“…A more detailed discussion can be found in ref. [32]. Similar morphologies as observed in the experiments can be produced in Monte Carlo simulations [37,38].…”

Section: Morphology Of An Interface Between Two Ionic Conductorssupporting

confidence: 76%

“…If we reverse the applied voltage, we expect the boundary to be stable. This picture is confirmed by the results of a linear stability analysis [32] for the moving solid/solid interface. A typical experimental result, demonstrating that the solid/solid interface is morphologically unstable is shown in Fig.…”

Section: Morphology Of An Interface Between Two Ionic Conductorssupporting

confidence: 64%

“…As a result of the different disorder types, the ionic conductivity in AgCl is about 6 orders of magnitude larger than in KCl. Experiments were done with AgCl-and KCl-single crystals, which were used in an electrochemical cell +/Ag/AgCl/KCl/Ag/- [32]. Silver-ions, Ag + , are driven by the applied electric potential difference from the Ag-anode to the boundary AgCl/KCl.…”

Section: Morphology Of An Interface Between Two Ionic Conductorsmentioning

confidence: 99%

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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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“…A more detailed discussion can be found in ref. [32]. Similar morphologies as observed in the experiments can be produced in Monte Carlo simulations [37,38].…”

Section: Morphology Of An Interface Between Two Ionic Conductorssupporting

confidence: 76%

Section: Morphology Of An Interface Between Two Ionic Conductorssupporting

confidence: 64%

Section: Morphology Of An Interface Between Two Ionic Conductorsmentioning

confidence: 99%

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Materials in thermodynamic potential gradients

Martin

2003

The Journal of Chemical Thermodynamics

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“…A related instability has been observed at a heterophase interfaces in an ionic system. 8 This strong electric field, commonly causes an electric current. In metallic systems, the resulting electron current interacts with the atoms in the solid causing an atomic flux known as electromigration.…”

Section: Introductionmentioning

confidence: 99%

Morphological stability of a heterophase interface under electromigration conditions

Klinger

Levin

Srolovitz

1996

Journal of Applied Physics

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The evolution of the interface between two mutually insoluble metallic phases, under the influence of a strong electric field is examined. A slight perturbation of the interface away from a plane yϭh(x) leads to a component of the electric field along the interface. This creates a diffusion flux of the individual atoms along the interface which, in turn, leads to an increase in the amplitude of the initial perturbation and thus to an interfacial profile instability. The processes is expected to be controlled by interface diffusion in response to three distinct driving forces: the electric field, internal stresses ͑which arise due to the accumulation or depletion of matter at the interface͒, and the interfacial curvature. The stress distribution along the interface was found from a self-consistent solution of the elastic problem. For the instability to occur, differences in effective atomic charges, elastic moduli and/or atomic mobilities of the two constituent metals are required. Small sinusoidal corrugations are shown to grow with time for a range of wavelengths. The corrugations can grow monotonically or vary in oscillatory manner, depending on their wavelength.

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“…(T = 563 K, t = 42 h, electric field = 10 V/mm, bottom: anode, top: cathode). The micrograph was taken in an optical microscope[32].…”

mentioning

confidence: 99%

Materials in thermodynamic potential gradients

Martin

2003

Pure and Applied Chemistry

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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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Instability of Moving Interfaces between Ionic Crystals KCl/AgCl

Cited by 11 publications

References 5 publications

Materials in thermodynamic potential gradients

Materials in thermodynamic potential gradients

Morphological stability of a heterophase interface under electromigration conditions

Materials in thermodynamic potential gradients

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