Calibration of material parameters based on 180∘ and 90∘ ferroelectric domain wall properties in Ginzburg–Landau–Devonshire phase field models.
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| Title: | Calibration of material parameters based on 180∘ and 90∘ ferroelectric domain wall properties in Ginzburg–Landau–Devonshire phase field models. |
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| Authors: | Flaschel, Moritz1 (AUTHOR) mflaschel@ethz.ch, De Lorenzis, Laura1 (AUTHOR) |
| Source: | Archive of Applied Mechanics. Dec2020, Vol. 90 Issue 12, p2755-2774. 20p. |
| Subjects: | Domain walls (String models), Phase transitions, Evolution equations, Calibration, Lattice dynamics |
| Abstract: | Ferroelectric phase field models based on the Ginzburg–Landau–Devonshire theory are characterized by a large number of material parameters with problematic physical interpretation. In this study, we systematically address the relationship between these parameters and the main properties of ferroelectric domain walls. A variational approach is used to derive closed form solutions for the polarization fields at the phase transition regions as well as for the propagation velocities of the domain walls. Introducing a modified set of material parameters, which appropriately scales different contributions to the free energy, we are able to accurately calibrate these parameters based on domain wall thickness and energy of both 180 ∘ and 90 ∘ domain walls. Moreover, the mobility parameter appearing in the Ginzburg–Landau evolution equation can be accurately calibrated based on the propagation velocity of the domain walls. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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