Mesoscopic Origin of Ferroelectric-Ferroelectric Transition in BaTiO3

Hershkovitz, Asaf; Johann, Florian; Barzilay, Maya; Avidor, Alon Hendler; Ivry, Yachin

doi:10.48550/arxiv.1903.12434

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“…Recently, domain dynamics were reported by means of direct observation with PFM during the orthogonal-totetragonal phase transition in a single-crystal BaTiO 3 , allowing mesoscopic-scale realization of this transition. 34 To overcome the discrepancy between the transition time scale and the experimental imaging setup time scale, the temperature was varied very slowly (∼1 K/h) with high temperature stability (noise level, ±0.015 K), allowing real-time polarization mapping during the phase transformation. 34 However, such a temperature control is not yet feasible for atomic-scale mapping.…”

Section: ■ Introductionmentioning

confidence: 99%

“…34 To overcome the discrepancy between the transition time scale and the experimental imaging setup time scale, the temperature was varied very slowly (∼1 K/h) with high temperature stability (noise level, ±0.015 K), allowing real-time polarization mapping during the phase transformation. 34 However, such a temperature control is not yet feasible for atomic-scale mapping. Hence, alternative methods must be sought.…”

Section: ■ Introductionmentioning

confidence: 99%

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Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping

Barzilay

Elangovan

Ivry

2019

ACS Appl. Electron. Mater.

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In ferroelectricity, atomic-scale dipole moments interact collectively to produce strong electromechanical coupling and switchable macroscopic polarization. Hence, the functionality of ferroelectrics emerges at a solid-solid phase transformation that is accompanied by a sudden disappearance of an inversion symmetry. Much effort has been put to understand the ferroelectric transition at the polarization length scale. Nevertheless, the dipole-moment origin of ferroelectricity has remained elusive. Here, we used variable-temperature high-resolution transmission electron microscopy to reveal the dipole-moment dynamics during the ferroelectric-to-paraelectric transition. We show that the transition occurs when paraelectric nuclei of the size of a couple of unit cells emerge near the surface. Upon heating, the cubic phase sidewalk grows towards the bulk. We quantified the nucleation barrier and show dominancy of mechanical interactions, helping us demonstrate similarities to predictions of domain nucleation during electric field switching. Our work motivates dynamic atomic-scale characterizations of solid-solid transitions in other materials.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping

Barzilay

Elangovan

Ivry

2019

ACS Appl. Electron. Mater.

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Mesoscopic Origin of Ferroelectric-Ferroelectric Transition in BaTiO3

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Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping

Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping

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Mesoscopic Origin of Ferroelectric-Ferroelectric Transition in BaTiO3

Cited by 1 publication

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Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO3: Atomic Scale Mapping

Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO3: Atomic Scale Mapping

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Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping

Surface Nucleation of the Paraelectric Phase in Ferroelectric BaTiO₃: Atomic Scale Mapping