Precipitate-domain wall topologies in hardened Li-doped NaNbO3

Gao, Shuang; Zhao, Changhao; Bohnen, Matthias; Müller, Ralf; Rödel, Jürgen; Kleebe, Hans‐Joachim

doi:10.1016/j.actamat.2023.118998

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…Another simulation was performed for a material with an elliptical inclusion, to mimic the precipitate shape observed in [4]. Figure 4 shows that the domain wall is again pinned to the inclusion, once it reaches it.…”

Section: Simulation Of Domain Wall Movementmentioning

confidence: 99%

“…Precipitates or doping effectively reduces domain wall mobility and heat dissipation, which results in narrower hysteresis loops of polarization versus applied electric field. Thus, the mechanical quality factor can be enhanced [4]. However, determining the optimal shape and size of the precipitates remains an open question.…”

Section: Introductionmentioning

confidence: 99%

“…However, determining the optimal shape and size of the precipitates remains an open question. In [4], for example, the observed precipitates appear to be plate like, with an elongated elliptical cross section.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of precipitate hardening in ferroelectric material

Bohnen,

Müller

2023

Proc Appl Math and Mech

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Precipitate hardening is introduced as a mechanism to tune the reaction of ferroelectric materials to the application of an external electric field. For this purpose, a phase field model for polarization in ferroelectric material is presented in this paper. Different materials with and without precipitates are simulated and the respective hysteresis curves for charge and macroscopic strain are derived. The results show a reduction of the hysteresis curves if precipitates are present in the material, which confirms the experimental observation of recent material studies.

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Section: Simulation Of Domain Wall Movementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of precipitate hardening in ferroelectric material

Bohnen,

Müller

2023

Proc Appl Math and Mech

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Topology optimization for precipitation hardening in ferroelectric material

Bohnen,

Müller

2024

Proc Appl Math and Mech

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Recent studies have shown that precipitation hardening effectively enhances the mechanical quality factor of ferroelectric material. In this work, Li‐doped , a material system with elliptical precipitates is investigated. We present a mechanical model to determine energetically stable precipitate shapes by minimizing the total energy, consisting of elastic and interface energy. Furthermore, we investigate the influence of external loads on the precipitate topology. Correct elastic constants as well as lattice misfits for the simulation are provided. The shapes determined from finite element simulations agree well with observed results.

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Electric field response of ferroelectric domains near non-polar precipitates in BaTiO3-based ceramics

Taylor,

Chaffee,

Liu

et al. 2024

Applied Physics Letters

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Precipitates have recently been found to significantly enhance the mechanical quality factor in piezoelectric ceramics. Such a piezoelectric hardening effect was attributed to strong interactions between ferroelectric domains and precipitates. In the present work, the response of domains to applied electric fields is observed in situ via transmission electron microscopy in aged (Ba, Ca)TiO3 ceramics with precipitates to reveal the underlying mechanism of this phenomenon. Ferroelectric domains in the Ba-rich matrix grain are observed to be more concentrated near non-polar Ca-rich precipitates. With increasing applied voltage, domains separate from precipitates merge together first, while those near precipitates persist to higher voltages. During ramping down, domains nucleate from precipitates. These direct observations confirm the strong interactions between ferroelectric domains and precipitates in piezoelectric ceramics.

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Precipitate-domain wall topologies in hardened Li-doped NaNbO3

Cited by 5 publications

References 36 publications

Simulation of precipitate hardening in ferroelectric material

Simulation of precipitate hardening in ferroelectric material

Topology optimization for precipitation hardening in ferroelectric material

Electric field response of ferroelectric domains near non-polar precipitates in BaTiO3-based ceramics

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