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| Description
| - It is known that domain wall motion greatly contributes to macroscopic permittivity and piezoelectric coefficients of polydomain ferroelectric samples. In the bulk of a ferroelectric material, the domain wall mobility is restricted by interactions of domain walls with crystal lattice defects. It is believed that crystal lattice defects cause pinning and bending of domain walls. Since understanding the two aforementioned phenomena is still rather limited, we theoretically analyze the system, where a segment of a domain wall interacts with a crystal lattice defect. The analysis has been performed using a general thermodynamic model based on the Landau-Ginzburg-Devonshire theory. The interaction of domain walls with crystal lattice defects has been introduced using an additional term in the free energy of the system. The model has been solved using numerical phase-field simulations and the results were compared with analytical solution of simplified domain-wall-bending model presented earlier [1]. We have identified situations where the domain wall motion is dominated by the motion of a planar domain wall, and those where the domain wall bends between pinning centers. We have analyzed the behavior of 180-degree and 90-degree domain walls in lead titanate. In the both cases, we have calculated macroscopic permittivity and the piezoelectric coefficients of the system, identifying the non-linearity of the macroscopic dielectric and electromechanical responses. We argue that analyzing experimental data on the linear and nonlinear contributions to permittivity, one can obtain information of the wall-defect interaction.
- It is known that domain wall motion greatly contributes to macroscopic permittivity and piezoelectric coefficients of polydomain ferroelectric samples. In the bulk of a ferroelectric material, the domain wall mobility is restricted by interactions of domain walls with crystal lattice defects. It is believed that crystal lattice defects cause pinning and bending of domain walls. Since understanding the two aforementioned phenomena is still rather limited, we theoretically analyze the system, where a segment of a domain wall interacts with a crystal lattice defect. The analysis has been performed using a general thermodynamic model based on the Landau-Ginzburg-Devonshire theory. The interaction of domain walls with crystal lattice defects has been introduced using an additional term in the free energy of the system. The model has been solved using numerical phase-field simulations and the results were compared with analytical solution of simplified domain-wall-bending model presented earlier [1]. We have identified situations where the domain wall motion is dominated by the motion of a planar domain wall, and those where the domain wall bends between pinning centers. We have analyzed the behavior of 180-degree and 90-degree domain walls in lead titanate. In the both cases, we have calculated macroscopic permittivity and the piezoelectric coefficients of the system, identifying the non-linearity of the macroscopic dielectric and electromechanical responses. We argue that analyzing experimental data on the linear and nonlinear contributions to permittivity, one can obtain information of the wall-defect interaction. (en)
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| Title
| - Pinning and bending of domain walls in lead titanate
- Pinning and bending of domain walls in lead titanate (en)
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| skos:prefLabel
| - Pinning and bending of domain walls in lead titanate
- Pinning and bending of domain walls in lead titanate (en)
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| skos:notation
| - RIV/46747885:24220/13:#0002433!RIV14-GA0-24220___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/46747885:24220/13:#0002433
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Ferroelectric domain wall; phase field simulations; permittivity (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...i/riv/kodPristupu
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/mistoVydani
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| http://linked.open...telVyzkumneZpravy
| - The Institute of Physics Jagiellonian University, Kraków, Poland
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Mokrý, Pavel
- Sluka, Tomáš
- Tagantsev, Alexander K.
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| http://localhost/t...ganizacniJednotka
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