Broadband micro-Brillouin scattering spectroscopy of Pb(B1/3B′2/3)O3-based relaxor ferroelectrics

Kojima, Seiji; Ko, Jae‐Hyeon

doi:10.1016/j.cap.2011.04.038

Cited by 18 publications

(8 citation statements)

References 62 publications

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“…Due to a slow micro-domain-domain interaction, dielectric response delay may happen. This argument is consistent with the lattice mode softening originated from the "PNR dynamics" indicated by Kojima and Ko [61]. 2) There seems to exist a sort of transition, macro-tomicro-domain sudden change, around 105 • C in PZN.…”

Section: A Domain Configuration and Dielectric Relaxationsupporting

confidence: 87%

“…This equipment could observe a specific softening of both optical and acoustic modes in PMN-PT and PZN-PT crystals down to 1 cm −1 . Peculiar acoustic anomalies in PMN-35%PT were reported [61]: longitudinal acoustic (LA) mode frequency showed a substantial softening around 1.5 cm −1 upon cooling toward the T C under assumptions that dynamical behaviors of PNRs should be observed as quasi-elastic scattering (or "central peak") in inelastic scattering experiments in a 0.03-33-cm −1 range, and the polarization fluctuations of PNRs are coupled to acoustic phonons [60]. The 1-cm −1 region dynamics in PMN-PT and PZN-PT clarified the precursor dynamics of PNRs, associated with the TO mode softening.…”

Section: B Soft Phonon Modes In Relaxor Ferroelectricsmentioning

confidence: 97%

“…4) Anharmonicity of Lattice Vibration in Relaxor Ferroelectrics: The soft phonon (TO) mode is expressed as ( soft TO ) 2 = A(T − T C ). In order to explain the smaller electrostrictive Q constant and larger Curie-Weiss constant C in relaxor FEs, in comparison with normal types, an order of magnitude lower A constant was verified by the recent advanced equipment [59], [61]. It would also be interesting to study the soft phonon frequency change with the degree of ionic order in crystals, in which the order is controllable by annealing.…”

Section: ) Complex Perovskite Ion Ordering Versus Ferroelectricmentioning

confidence: 97%

See 2 more Smart Citations

Electrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background

Uchino

2022

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Electrostrictive effects in complex-perovskite "relaxor" ferroelectrics (FEs) exhibit superior performance in comparison with the simple-perovskite normal FEs, such as giant electrostriction in its paraelectric phase and high electromechanical coupling in its FE phase. As one of the discoverers, the author will deliver the historical background of these epoch-making phenomena and the development strategy of how we considered performance improvement. Though both discoveries were actually originated from a sort of "serendipity" (lucky & accidental occurrence!), some of the key factors have been embedded in the research base: 1) interrelation between complex perovskite structure and ferroelectricity; 2) anharmonicity in relaxor FEs; and 3) microdomain contribution in relaxor FEs. In the last part of this article, the author introduces a bit different "mesoscopic" approach, "fractal analysis of microdomain configuration" in conjunction with the "domain engineering" concept, to distinguish the electromechanical coupling among the normal and relaxor FEs for remaining the future research seeds.

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Section: A Domain Configuration and Dielectric Relaxationsupporting

confidence: 87%

Section: B Soft Phonon Modes In Relaxor Ferroelectricsmentioning

confidence: 97%

Section: ) Complex Perovskite Ion Ordering Versus Ferroelectricmentioning

confidence: 97%

See 1 more Smart Citation

Electrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background

Uchino

2022

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…The softening of the LA mode frequency along with increasing hypersonic damping has been commonly observed in many perovskite ferroelectrics and relaxors [18]. From the thermodynamic point of view, the coupling between the order parameter (i.e., polarization in this case) and the strain induces anomalous changes in the sound velocity and the elastic constant at the phase transition point [19].…”

Section: Resultsmentioning

confidence: 98%

Precursor dynamics in rhodium-doped barium titanate single crystals studied by Brillouin light scattering and birefringence measurements

Kim

Kojima

et al. 2012

Phase Transitions

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The dynamics of precursor polar clusters in rhodium(Rh)-doped barium titanate single crystals were examined in the paraelectric phase by Brillouin light scattering and birefringence measurements in a wide temperature range. The longitudinal acoustic (LA) mode and central peaks in the inelastic light scattering spectrum were investigated by Brillouin scattering, while the temperature dependence of the birefringence was accurately determined by means of a birefringence imaging system. In a specific temperature range above the ferroelectric phase transition temperature, the LA mode frequency exhibited a significant softening concomitant with the substantial increase in the hypersonic damping, which was attributed to the formation of polar clusters and their interactions with acoustic waves. In this temperature range where acoustic anomalies were brought about, the birefringence showed non-zero values, indicating the existence of local noncentrosymmetric regions. All these results clearly indicated that the off-centered motions of Ti ions in the oxygen octahedra in Rh-doped BaTiO 3 are correlated in the paraelectric phase inducing slowing down of the precursor dynamics and anomalous birefringence, similar to pure BaTiO 3 (Ko et al., Phys. Rev. B 84, 094123 (2011)). The effect of rhodium doping in BaTiO 3 enhanced the first-order character of the ferroelectric phase transition.

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“…20 The LA velocity shows a remarkable softening in the vicinity of the cubic-tetragonal ferroelectric phase transition temperature, T C-T ¼ 308 K, while the TA velocity shows only a slight softening and a small discontinuity at T C-T , reflecting the nature of a slightly first order phase transition. [21][22][23][24] Such softening of the velocity and the increase in the attenuation in the cubic phase are caused by the piezoelectric coupling of the strain polarization fluctuations in the noncentrosymmetric PNRs below the T B . 25 The remarkable increase in the absorption coefficient of the LA mode towards T C-T ¼ 308 K was clearly observed as shown in Fig.…”

Section: B Acoustic Anomaly and Central Peakmentioning

confidence: 99%

Relaxor-like dynamics of ferroelectric K(Ta1−xNbx)O3 crystals probed by inelastic light scattering

Rahaman

Imai

Miyazu

et al. 2014

Journal of Applied Physics

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The relaxor-like dynamics of the cubic-tetragonal ferroelectric phase transition was studied by Brillouin and Raman scattering in K(Ta 1Àx Nb x)O 3 (KTN) crystals with x ¼ 0.40 (KTN40). The local symmetry breaking by the polar nanoregions (PNRs) was observed in a paraelectric phase by Raman scattering on the A 1 (z) mode of the PNRs with R3m symmetry. Upon cooling from a high temperature, the remarkable increase in the LA phonon damping starts at 45 K above the cubictetragonal phase transition temperature of T C-T ¼ 308 K, which is defined as the intermediate temperature, T* $ 353 K, indicating the start of the rapid growth of the PNRs. The coupling between the LA mode and fluctuation of the PNRs caused a remarkable elastic anomaly in the vicinity of T C-T. The analysis of the temperature dependent central peak shows a critical slowing down towards T C-T , which is the evidence for the order-disorder nature of a ferroelectric phase transition. The evolution of the dynamic PNRs is discussed by the estimation of their length scale, and it is found that it starts to increase near T* and gradually grows towards T C-T. V

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Broadband micro-Brillouin scattering spectroscopy of Pb(B1/3B′2/3)O3-based relaxor ferroelectrics

Cited by 18 publications

References 62 publications

Electrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background

Electrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background

Precursor dynamics in rhodium-doped barium titanate single crystals studied by Brillouin light scattering and birefringence measurements

Relaxor-like dynamics of ferroelectric K(Ta1−xNbx)O3 crystals probed by inelastic light scattering

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