Effect of Sn substitution on the elastic anomalies and phase transition behaviors of antiferroelectric PbHfO3 single crystals studied by Brillouin scattering

Hong, J. T.; Lee, Byoung Wan; Ko, Jae‐Hyeon; Jankowska‐Sumara, Irena; Podgórna, Maria; Majchrowski, A.

doi:10.1016/j.cap.2018.03.017

Cited by 7 publications

(12 citation statements)

References 24 publications

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“…A recent Brillouin scattering study showed that the phase transition at T C for this PHS composition is accompanied by the softening of longitudinal accoustic (LA) mode and substantial hypersonic damping. 23 Strong softening of the LA mode and noticeable broadening of the LA mode are consistent with the assumption that precursor polar regions already exist in the PE phase. The lattice-dynamical theory described in 3,4,38 predicts the existence of precursor, noncentrosymmetric polar regions that appear in the centrosymmetric matrix due to the specific coupling of the zone center transverse optic mode, and located near the zone-center acoustic mode.…”

Section: Raman Scattering Resultssupporting

confidence: 80%

“…In 22,23 we reported the existence of needlelike domain structure in the IM phase, pointing out the ferroelastic type/ character of this phase, and the existence of some symmetrybreaking elements inferred from measurements of Brillouin scattering. Surely, the IM phase is thus not cubic yet, but the exact symmetry of this phase has still not been resolved.…”

Section: X-ray Diffraction Resultsmentioning

confidence: 77%

“…The results are consistent with those already published in. 23 The PE-IM phase transition at T C = 478 K is connected with a divergence of dielectric permittivity. A few degrees below (at T 2 = 473 K) an anomaly in form of change in slope of the ε′(T) characteristic is visible.…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…20 In our studies, we noticed that isovalent doping of PHO by Sn ions (forming solid solution) produces effects similar to those of the hydrostatic pressure. [21][22][23][24][25] It is due to the fact that in PHS, a larger Hf 4+ ion (r = 0.71 Å) is replaced by a smaller Sn 4+ ion (r = 0.67 Å) in the central position in oxygen octahedra. Such doping can be understood as chemical pressure, since Sn 4+ ions have slightly smaller ionic radii.…”

Section: Introductionmentioning

confidence: 99%

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The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

Jankowska‐Sumara

Majchrowski

2021

J. Am. Ceram. Soc.

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Pb(Hf 1−x Sn x )O 3 single crystals with x = 0.08 were characterized using single-crystal X-ray diffraction and Raman scattering, in a wide temperature range. The information concerning the structure of two intermediate phases (IMs), situated between lowtemperature antiferroelectric A1 and high-temperature paraelectric PE phases, was obtained. The lower temperature IM, A2, is characterized by incommensurate displacive modulations in the Pb sublattice. The higher temperature IM, is characterized by tilting of oxygen octahedra, and serious disorder coming from lead ions represented by X-ray diffuse scattering. Optical phonons and phase transitions in Pb(Hf 1−x Sn x ) O 3 single crystals were investigated by temperature-dependent Raman spectra. It was found that several soft modes control the phase transition between two antiferroelectric phases indicating its displacive character, whereas, in the paraelectric phase, both soft modes and Rayleigh scattering were observed.

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Section: Raman Scattering Resultssupporting

confidence: 80%

Section: X-ray Diffraction Resultsmentioning

confidence: 77%

Section: Dielectric Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

Jankowska‐Sumara

Majchrowski

2021

J. Am. Ceram. Soc.

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“…These observations clearly indicate the existence of non-centrosymmetric local regions in the centrosymmetric matrix of PZSO. Figure 23 shows temperature dependences of the νB and the ΓB, respectively, of the LA mode of PHO, PbHf0.70Sn0.30O3 (PHSO-0.30) measured at the backscattering geometry [64]. The data of PbHf0.975Sn0.025O3 (PHSO-0.025) were taken from Ref.…”

Section: Rhombohedral Distortionmentioning

confidence: 99%

The intricate lattice dynamics of perovskite oxides

Bussmann‐Holder

Roleder

2021

Mat & Dev

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The lattice dynamics of perovskite oxides are investigated theoretically within the polarizability model which is a nonlinear approach taking into account anharmonic electron-lattice interactions. The emphasis is on local lattice anomalies which appear in the phonon modes dispersion. Above the actual phase transition temperature finite size polarized clusters appear at an onset temperature TBH which marks the precursor formation temperature. These local anomalies appear as well experimentally and are reviewed for various perovskite compounds.

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Effect of Sn Addition on Thermodynamic, Dielectric, Optical, and Acoustic Properties of Lead Hafnate

Piekara

Lee

et al. 2020

Physica Status Solidi (a)

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Specific heat, dielectric properties, domain structure, and Brillouin light scattering studies in antiferroelectric PbHf1−xSnxO3 single crystals with three different concentrations (x = 0.08, 0.1, and 0.23) are performed in function of temperature. The specific heat and dielectric data reveal clear anomalies at three temperatures denoted as T1, T2, and TC. At T1, transition from the antiferroelectric AFE1 to another antiferroelectric AFE2 phase is realized, the next phase transition (PT) is from AFE2 to an intermediate (IM) phase—at T2, and from IM to paraelectric (PE) phase at TC. PTs at T1 and T2 are definitely of the first order, whereas the PT at TC has features of the second‐order PT. The PT sequences are confirmed by changes in the domain structure. In the PE phase, Brillouin studies reveal the softening and broadening of longitudinal acoustic (LA) mode in the cooling process. The softening and broadening exhibit the maximum values near TC. The transverse acoustic (TA) mode appears near T2. Additional acoustic anomalies are also observed at T1. The temperature dependencies of LA mode indicate the existence of polar regions in PE phase and order–disorder character of the PT at TC. The other PTs are mainly of a displacive character.

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Effect of Sn substitution on the elastic anomalies and phase transition behaviors of antiferroelectric PbHfO3 single crystals studied by Brillouin scattering

Cited by 7 publications

References 24 publications

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

The intricate lattice dynamics of perovskite oxides

Effect of Sn Addition on Thermodynamic, Dielectric, Optical, and Acoustic Properties of Lead Hafnate

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Effect of Sn substitution on the elastic anomalies and phase transition behaviors of antiferroelectric PbHfO3 single crystals studied by Brillouin scattering

Cited by 7 publications

References 24 publications

The complexity of structural phase transitions in Pb(Hf0.92Sn0.08)O3 single crystals

The complexity of structural phase transitions in Pb(Hf0.92Sn0.08)O3 single crystals

The intricate lattice dynamics of perovskite oxides

Effect of Sn Addition on Thermodynamic, Dielectric, Optical, and Acoustic Properties of Lead Hafnate

Contact Info

Product

Resources

About

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals

The complexity of structural phase transitions in Pb(Hf_0.92Sn_0.08)O₃ single crystals