Tetyana Ostapchuk

Experimentally constrained modeling of the Pockels response of KNbO3 and KTaNbO3

Virginie de Mestral, Lorenzo Bastonero, Petr Bednyakov, Fedir Borodavka et autres

The soft-mode of electro-optic (EO) metal-oxide perovskites plays a critical role in determining their Pockels responses. This is the case of potassium tantalate niobate (KTN), which exhibits an intrinsic Pockels response 2.5 times larger than that of state-of-the-art barium titanate (BTO), highlighting …

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Experimentally constrained modeling of the Pockels response of KNbO3 and KTaNbO3

Virginie de Mestral, Lorenzo Bastonero, Petr Bednyakov, Fedir Borodavka et autres

The soft-mode of electro-optic (EO) metal-oxide perovskites plays a critical role in determining their Pockels response. This is the case of potassium tantalate niobate (KTN), which exhibits an intrinsic Pockels response 2.5 times larger than that of state-of-the-art barium titanate (BTO), highlighting …

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Giant photostriction in lead-free ferroelectric stemming from photo-excited thermalized carriers

Gaëlle Vitali-Derrien, Oana Andreea Condurache, Antoine Ducournau, Pascale Gémeiner et autres

Ferroelectrics are polar materials whose polarization can be switched by applying electric fields; they offer unique opportunities to develop performant photostrictive materials, i.e., materials that can deform under visible light illumination. Naturally devoid of inversion symmetry, they exhibit original photogalvanic effects such …

Giant photostriction in lead-free ferroelectric stemming from photo-excited thermalized carriers

Gaëlle Vitali-Derrien, Oana Andreea Condurache, Antoine Ducournau, Pascale Gémeiner et autres

Ferroelectrics are polar materials whose polarization can be switched by applying electric fields; they offer unique opportunities to develop performant photostrictive materials, i.e., materials that can deform under visible light illumination. Naturally devoid of inversion symmetry, they exhibit original photogalvanic effects such …

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Ferroelectric soft mode and microwave dielectric relaxation in BaTiO3−PbMg1/3Nb2/3O3 ceramics

Viktor Bovtun, D. Nuzhnyy, Martin Kempa, Tetyana Ostapchuk et autres

${\mathrm{BaTiO}}_{3}$ (BT) is the best-known ferroelectric and $\mathrm{Pb}{\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN) is the best-known relaxor ferroelectric, but their solid solutions were so far studied only very scarcely. Here the high-density perovskite ceramic solid solutions of $(1\ensuremath{-}x){\mathrm{BaTiO}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}{\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (BT-100$x$%PMN, $x=0.075$, 0.10, 0.15) were studied by the …

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Two-phase dielectric polar structures in 0.1NBT-0.6ST-0.3PT solid solutions

Šarūnas Svirskas, Vladimir V. Shvartsman, Marija Dunce, Reinis Ignatāns et autres

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Incipient ferroelectricity of water molecules confined to nano-channels of beryl

Boris P. Gorshunov, V. I. Torgashev, Elena S. Zhukova, V. G. Thomas et autres

Abstract Water is characterized by large molecular electric dipole moments and strong interactions between molecules; however, hydrogen bonds screen the dipole–dipole coupling and suppress the ferroelectric order. The situation changes drastically when water is confined: in this case ordering of the molecular …

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Broadband dielectric spectroscopy of standard and core-shell BaTiO3-NiO ceramic composites compared to the BaTiO3 ceramics

D. Nuzhnyy, J. Petzelt, Viktor Bovtun, Tetyana Ostapchuk et autres

Using spark plasma sintering we have processed and studied two ceramic composites of 70 vol% BaTiO3 (BTO) and 30 vol% NiO with different topologies: standard and core-shell composites. The materials were characterized by X-ray diffraction and scanning electron microscopy and studied by …

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Effective dielectric function of BaTiO3-NiO composites

D. Nuzhnyy, J. Petzelt, Viktor Bovtun, Tetyana Ostapchuk et autres

Using spark plasma sintering we have processed and studied two ceramic composites of 70 vol% BaTiO3 (BTO) and 30 vol% NiO with standard and core-shell microstructure. Quantitative broadband dielectric spectroscopy up to the infrared range at 10-450 K showed substantial differences between …

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Atomistic modeling of diffuse scattering in cubic PbZrO3

Marek Paściak, Thomas Richard Welberry, Aidan P. Heerdegen, V. V. Laguta et autres

We present a joint theoretical and experimental study on diffuse scattering in cubic PbZrO3. A comprehensive synchrotron data-set reveals ⟨110⟩-oriented diffuse streaks emanating from Bragg reflections and showing a strong intensity variation in the vicinity of selected M points. The intensity distribution …

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Anisotropic dielectric response of lead zirconate crystals in the terahertz and infrared range at low temperature

Tetyana Ostapchuk, Christelle Kadlec, P. Kužel, J. Kroupa et autres

Polarized terahertz transmittance and infrared reflectivity measurements were performed on selected lead zirconate crystals at T = 10 K. The fit of the spectra enabled us to obtain all three principal components of its anisotropic dielectric function and the corresponding parameters of …

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Catching the intermediate phase in PZT 99/1 single crystals

E. Buixaderas, Tetyana Ostapchuk, J. Kroupa, M. Savinov et autres

We have investigated single crystals of PbZrO3 substituted with 1% of Ti (PZT 99/1) by means of optical microscopy, micro-Raman scattering, second harmonic generation and dielectric spectroscopy, on heating to and cooling from its cubic phase. Our measurements confirm that these crystals …

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