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Ohwada, Kenji; Hirota, K.; Terauchi, Hikaru; Fukuda, Tatsuo; Tsutsui, Satoshi; Baron, Alfred Q. R.; Мizuki, J.; Ohwa, Hidehiro; Yasuda, Naohiko

doi:10.1103/physrevb.77.094136

Cited by 22 publications

(10 citation statements)

References 33 publications

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“…Thus, dielectric measurement, inelastic light scattering (both Brillouin and Raman scatterings), inelastic neutron scattering, and inelastic x-ray scattering have been performed in various studies. 11,[14][15][16][17][18][19][20][21][22][23] Of note, the study of acoustic phonons in ferroelectric materials is one of the most powerful approaches for investigating the polarization fluctuations related to a ferroelectric phase transition. 24 This is because acoustic properties are influenced by polarization fluctuations through strainpolarization coupling.…”

Section: Introductionmentioning

confidence: 99%

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
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The precursor dynamics of ferroelectric phase transitions in relaxor-based ferroelectric (1 − x) Pb(Zn 1/3 Nb 2/3 )O 3 -xPbTiO 3 single crystals, with x = 0.07, 0.10, and 0.12, were investigated using inelastic light scattering from a longitudinal acoustic phonon. An acoustic anomaly in a broad temperature range, which is characteristic of relaxor ferroelectrics, was observed. We describe the anomalies in the paraelectric phase by assuming local piezoelectric coupling inside polar nanoregions, which are surrounded by a nonpolar matrix. On the basis of local piezoelectric coupling, a relaxation time τ and a dynamic characteristic length L of the order-parameter (polarization) fluctuations were determined to be in the order of 10 −13 s and 10 −9 m, respectively. The τ and L values increase sharply upon cooling from high temperatures but more gradually below the intermediate temperature T * (=493 − 510 K). This result implies that the local polarization fluctuations grow rapidly upon cooling down to above T * and the growth rate decreases below T * . The inflexion point of this growth process in the paraelectric phase is related to the characteristic properties of relaxor-based solid solutions.

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Section: Introductionmentioning

confidence: 99%

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
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“…In this case, the dielectric constant is enhanced by the localised vibrations (fractons). However, when In and Nb are ordered on the B sites, the zone-boundary transverse-acoustic (TA) phonon mode softens and induces the antiferroelectric phase at T N 48–50 . This is because short wavelength vibrations such as the zone-boundary TA phonons are easily affected by the occupation of the B sites.…”

Section: Resultsmentioning

confidence: 99%

“…These crystals had dimensions of 2 × 2 × 1 mm 3 and a pseudocubic (100) plane crystal habit. Because larger PIN crystals cannot be grown, and because indium has a large neutron-absorption coefficient, high-energy-X-ray and visible-light measurements are preferable to neutrons 48,49,53 . Before being measured, these crystals were etched with hydrofluoric acid (HF-etched) to remove the outer layers.…”

Section: Methodsmentioning

confidence: 99%

Relation between Fractal Inhomogeneity and In/Nb-Arrangement in Pb(In1/2Nb1/2)O3

Tsukada

Ohwada

Ohwa

et al. 2017

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Relaxor ferroelectrics show substantial responses to electric fields. The key difference from normal ferroelectrics is a temperature-dependent inhomogeneous structure and its dynamics. The lead-based complex perovskite Pb(In1/2Nb1/2)O3 is an intriguing system in which the inhomogeneous structure can be controlled by thermal treatment. Herein, we report investigations of the phase transitions in single crystals of Pb(In1/2Nb1/2)O3 via changing the degree of randomness in which In and Nb occupy the B site of the ABO3 perovskite structure. We studied the dynamic properties of the structure using inelastic light scattering and the static properties using diffuse X-ray scattering. These properties depend on the degree of randomness with which the B site is occupied. When the distribution of occupied In/Nb sites is regular, the antiferroelectric phase is stabilised by a change in the collective transverse-acoustic wave, which suppresses long-range ferroelectric order and the growth of the inhomogeneous structure. However, when the B site is occupied randomly, a fractal structure grows as the temperature decreases below T *~475 K, and nanosized ferroelectric domains are produced by the percolation of self-similar and static polar nanoregions.

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“…34 This alignment is believed to result from chemical disorder of the B-site cations for some relaxors with perovskite structure. [35][36][37] Since the underlying mechanisms have proved to be difficult to probe experimentally, theoretical calculations [38][39][40][41][42] and atomistic simulations [43][44][45][46][47][48][49][50] of lead-based relaxors are widely used. In addition, neutron scattering experiments have been carried out to specifically investigate the relaxation dynamics leading to their frequency-dependent properties.…”

Section: Introductionmentioning

confidence: 99%

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
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The local dynamics of the lead-free relaxor 0.964Na 1/2 Bi 1/2 TiO 3 − 0.036BaTiO 3 (NBT-3.6BT) have been investigated by a combination of quasielastic neutron scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we were able to show that the tetragonal platelets in the microstructure are crucial for understanding the dielectric properties of NBT-3.6BT [F. Pforr et al., Phys. Rev. B 94, 014105 (2016)]. To investigate their dynamics, ab initio molecular dynamics simulations were carried out using Na 1/2 Bi 1/2 TiO 3 with 001 cation order as a simple model system for the tetragonal platelets in NBT-3.6BT. Similarly, 111-ordered Na 1/2 Bi 1/2 TiO 3 was used as a model for the rhombohedral matrix. The measured single crystal QENS spectra could be reproduced by a linear combination of calculated spectra. We find that the relaxational dynamics of NBT-3.6BT are concentrated in the tetragonal platelets. Chaotic stages, during which the local tilt order changes incessantly on the timescale of several picoseconds, cause the most significant contribution to the quasielastic intensity. They can be regarded as an excited state of tetragonal platelets, whose relaxation back into a quasistable state might explain the frequency dependence of the dielectric properties of NBT-3.6BT in the 100 GHz to THz range. This substantiates the assumption that the relaxor properties of NBT-3.6BT originate from the tetragonal platelets.

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Intrinsic ferroelectric instability inPb(In1∕2Nb1∕2)

Cited by 22 publications

References 33 publications

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
View full text Add to dashboard Cite

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
View full text Add to dashboard Cite

Relation between Fractal Inhomogeneity and In/Nb-Arrangement in Pb(In1/2Nb1/2)O3

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
8
0
2
0
View full text Add to dashboard Cite

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Intrinsic ferroelectric instability inPb(In1∕2Nb1∕2)

Cited by 22 publications

References 33 publications

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/Tsukada1, Hidaka2, Kojima3 et al. 2013Phys. Rev. B252250View full textAdd to dashboardCite

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/Tsukada1, Hidaka2, Kojima3 et al. 2013Phys. Rev. B252250View full textAdd to dashboardCite

Relation between Fractal Inhomogeneity and In/Nb-Arrangement in Pb(In1/2Nb1/2)O3

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036Pforr1, Meyer2, Major3 et al. 2017Phys. Rev. B8020View full textAdd to dashboardCite

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Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
View full text Add to dashboard Cite

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
25
2
25
0
View full text Add to dashboard Cite

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3−0.036
Pforr
¹
,
Meyer
²
,
Major
³

et al. 2017
Phys. Rev. B
8
0
2
0
View full text Add to dashboard Cite