Acoustic anomalies of ferroelectric Ba0.79Sr0.21TiO3 single crystals studied by using Brillouin spectroscopy

Shin, Seonhyeop; Ko, Jae‐Hyeon; Won, Choongjae; Hur, N.

doi:10.3938/jkps.66.989

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The substantial increase in ΓB indicates the growth in the size of polar clusters, which is consistent with the theoretical prediction as described. Previous studies showed that inclusion of Ca, Sr, K or F into the A or B sites of the perovskite structure introduces substitutional disorder and enhances diffuseness [46][47][48][49][50]. In addition, these substitutions increase the Brillouin shift of the LA mode thus C11.…”

Section: Precursor Effects To the Phase Transitions: Elastic Anomalies Of Ferroelectric And Antiferroelectrics With Perovskite Structuresmentioning

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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Section: Precursor Effects To the Phase Transitions: Elastic Anomalies Of Ferroelectric And Antiferroelectrics With Perovskite Structuresmentioning

confidence: 99%

The intricate lattice dynamics of perovskite oxides

Bussmann‐Holder

Roleder

2021

Mat & Dev

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Effects of oxygen deficiency on the acoustic anomalies and phase transition behaviors of barium titanate single crystals

Shin

Jang

et al. 2018

Current Applied Physics

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Micro-Raman scattering and dielectric investigations of phase transitions behavior in the PbHf0.7Sn0.3O3 single crystal

Jankowska‐Sumara

Podgórna

et al. 2017

Journal of Applied Physics

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Raman light scattering was used to detect the sequence of transitions in a PbHf1-xSnxO3 (PHS) single crystal with x = 0.30 in a temperature range of 77–873 K. Changes of Raman spectra were observed in the vicinity of structural phase transitions: between the antiferroelectric (AFE1)–antiferroelectric (AFE2)—intermediate—paraelectric phases. Light scattering and dielectric investigations were used to find out the nature and sequence of the phase transition, as well as the large dielectric permittivity values measured at the phase transition, by searching for the soft-phonon-mode behavior. The experimentally recorded spectra were analyzed in terms of the damped-harmonic oscillator model for the phonon bands. It is demonstrated that the structural phase transformations in PHS can be considered as the result of softening of many modes, not only the ferroelectric one. It was also proved that locally broken symmetry effects are present at temperatures far above the Curie temperature and are connected with the softening of two optic modes of different nature.

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Acoustic anomalies of ferroelectric Ba0.79Sr0.21TiO3 single crystals studied by using Brillouin spectroscopy

Cited by 3 publications

References 22 publications

The intricate lattice dynamics of perovskite oxides

The intricate lattice dynamics of perovskite oxides

Effects of oxygen deficiency on the acoustic anomalies and phase transition behaviors of barium titanate single crystals

Micro-Raman scattering and dielectric investigations of phase transitions behavior in the PbHf0.7Sn0.3O3 single crystal

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