The unusual temperature dependence of the switching behavior in a ferroelectric single crystal with dislocations

Wu, Hong‐Hui; Wang, Jie; Cao, Shigu; Chen, Lei; Zhang, Tong‐Yi

doi:10.1088/0964-1726/23/2/025004

Cited by 18 publications

(7 citation statements)

References 35 publications

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“…For example, the multiwell nature of the energy dictates that even if the system is driven towards minimum energy, it may only reach a local energy minimum. Defects, such as trapped charge [23], dislocations [24], dopant atoms [25] and so forth, also play a role, affecting both the energetics and kinetics [26]. Nevertheless, substantial progress in understanding domain patterns has been made by considering energy minimization in perfect crystals.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale periodic domain patterns in tetragonal ferroelectrics: A phase-field study

2016

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Ferroelectrics form domain patterns that minimize their energy subject to imposed boundary conditions. In a linear, constrained theory, that neglects domain wall energy, periodic domain patterns in the form of multi-rank laminates can be identified as minimum-energy states. However, when these laminates (formed in a macroscopic crystal) comprise domains that are a few nanometers in size, the domain-wall energy becomes significant, and the behaviour of laminate patterns at this scale is not known. Here, a phase-field model, which accounts for gradient energy and strain energy contributions, is employed to explore the stability and evolution of the nanoscale multi-rank laminates. The stress, electric field, and domain wall energies in the laminates are computed. The effect of scaling is also discussed. In the absence of external loading, stripe domain patterns are found to be lower energy states than the more complex, multi-rank laminates, which mostly collapse into simpler patterns. However, complex laminates can be stabilized by imposing external loads such as electric field, average strain and polarization. The study provides insight into the domain patterns that may form on a macroscopic single crystal but comprising of nanoscale periodic patterns, and on the effect of external loads on these patterns. arXiv:1803.06564v1 [cond-mat.mtrl-sci]

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Section: Introductionmentioning

confidence: 99%

Nanoscale periodic domain patterns in tetragonal ferroelectrics: A phase-field study

2016

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“…The domain configuration and polarization switching are a direct consequence of the minimization process of the total free energy over a whole simulated system, 42,43 which is a function of polarization, polarization gradient, strain and electric field. The domain configuration and polarization switching are a direct consequence of the minimization process of the total free energy over a whole simulated system, 42,43 which is a function of polarization, polarization gradient, strain and electric field.…”

Section: Methodsmentioning

confidence: 99%

Double hysteresis loops and large negative and positive electrocaloric effects in tetragonal ferroelectrics

Zhu

Zhang

2015

Phys. Chem. Chem. Phys.

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Phase field modelling and thermodynamic analysis are employed to investigate depolarization and compression induced large negative and positive electrocaloric effects (ECEs) in ferroelectric tetragonal crystalline nanoparticles. The results show that double-hysteresis loops of polarization versus electric field dominate at temperatures below the Curie temperature of the ferroelectric material, when the mechanical compression exceeds a critical value. In addition to the mechanism of pseudo-first-order phase transition (PFOPT), the double-hysteresis loops are also caused by the abrupt rise of macroscopic polarization from the abc phase to the c phase or the sudden fall of macroscopic polarization from the c phase to the abc phase when the temperature increases. This phenomenon is called the electric-field-induced-pseudo-phase transition (EFIPPT) in the present study. Similar to the two types of PFOPTs, the two types of EFIPPTs cause large negative and positive ECEs, respectively, and give the maximum absolute values of negative and positive adiabatic temperature change (ATC ΔT). The temperature associated with the maximum absolute value of negative ATC ΔT is lower than that associated with the maximum positive ATC ΔT. Both maximum absolute values of ATC ΔTs change with the variation in the magnitude of an applied electric field and depend greatly on the compression intensity.

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“…Domain walls are borders between regions with different spontaneous polarization orientations. Such nucleation and pinning of ferroelectric domain walls at dislocations has been predicted in several simulations [5], leading to a change in ferroelectric and ferroelastic domain structure, polarization, and coercive field (electric field at which domains switch) [6]. Most of these predictions have been experimentally demonstrated only in thin films [7] or around indentations [8].…”

Section: Introductionmentioning

confidence: 92%

High-temperature plastic deformation of $$\langle 110\rangle$$-oriented BaTiO3 single crystals

Höfling

Porz

Scherer

et al. 2022

Journal of Materials Research

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BaTiO3 single crystals were deformed in compression along the $$\langle 110\rangle$$ ⟨ 110 ⟩ crystal axis to study the plastic deformability and dislocation structures at high temperatures under different loading conditions. The yield strength is determined from stress–strain curves under strain rate control, load control, strain rate cycling tests, and under step-wise loading conditions to elucidate the impact of measurement approach in yield strength behavior. A comparison between the chosen methods based on stress-dependent strain rate plots indicates that load control measurements are a suitable alternative to the commonly used strain rate-control experiments in metals. This allows avoiding overloading and providing an estimate of the overall achievable strain rates in a ceramic. Activation energies and activation volumes in the temperature range of 1100–1170 °C indicate a similar mechanical deformation behavior to SrTiO3. Graphical abstract

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The unusual temperature dependence of the switching behavior in a ferroelectric single crystal with dislocations

Cited by 18 publications

References 35 publications

Nanoscale periodic domain patterns in tetragonal ferroelectrics: A phase-field study

Nanoscale periodic domain patterns in tetragonal ferroelectrics: A phase-field study

Double hysteresis loops and large negative and positive electrocaloric effects in tetragonal ferroelectrics

High-temperature plastic deformation of $$\langle 110\rangle$$-oriented BaTiO3 single crystals

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