Phase transitions in

Lehnen, P.; Kleemann, W.; Woike, Th.; Pankrath, R.

doi:10.1007/s100510051072

Cited by 92 publications

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“…pyroelectricity. However, it has been shown that SBN has a critical phase-transition temperature T c , and some critical exponents are determined by evaluating the temperature dependence of the birefringence (Lehnen et al, 2000) or NMR measurements (Blinc et al, 2001). On the basis of these results Lehnen et al (2001) have proposed a random-®eld Ising model to explain the relaxor behaviour of SBN.…”

Section: Introductionmentioning

confidence: 99%

The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution

Woike

Petřı́ček

Dušek

et al. 2003

Acta Crystallogr Sect B

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The structure of a crystal of Sr0.61Ba0.39Nb2O6 has been solved and refined as an incommensurate structure in five-dimensional superspace. The structure is tetragonal, superspace group P4bm(\,pp1/2,p - p1/2), unit-cell parameters a = 12.4566 (9), c = 7.8698 (6) Å, modulation vectors q 1 = 0.3075 (6) (a* + b*), q 2 = 0.3075 (6) (a* − b*). The data collection was performed on a KUMA-CCD diffractometer and allowed the integration of weak first-order satellite reflections. The structure was refined from 2569 reflections to a final value of R = 0.0479. The modulation affects mainly the positions of the O atoms, which are displaced by as much as 0.5 Å, and the site 4c that is occupied by Sr and Ba atoms. Only a simplified model, in which this atomic position is occupied by an effective atom Sr/Ba, could be refined from the data set. The modulation of displacement parameters has been used to account for the modulated distribution of Sr and Ba. The whole refinement uses only first-order modulation waves, but there are strong indications that for a complete solution the use of higher-order satellites and a more complicated model is necessary.

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Section: Introductionmentioning

confidence: 99%

The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution

Woike

Petřı́ček

Dušek

et al. 2003

Acta Crystallogr Sect B

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“…2, however, clearly shows that the presence of ferroelectric domains is not a necessary prerequisite of this phenomenon, since an ordered internal charge distribution could be obtained at 145 C, well into the paraelectric phase. This is due to local polar clusters, which exist in relaxor ferroelectrics up to the so-called Burns temperature T B [24], more than 350 C in SBN [25]. These polar clusters are very mobile and can be aligned even with small external electric fields.…”

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Polarization-Based Adjustable Memory Behavior in Relaxor Ferroelectrics

et al. 2002

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The irreversible decay of the spontaneous polarization above the phase-transition temperature is a limiting factor in any application of ferroelectric crystals. Here we show that electric fields applied at high temperatures induce a preferred direction in the crystal which is stable even after repeated heating and cooling through the phase transition. This preference in direction leads to a reorientation of domains in the ferroelectric phase. We use pyroelectric measurements to show that the directional preference originates from internal charge carriers interacting with domain walls.

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“…The existence of PNRs has been indicated by unusual properties such as deviations of the index of refraction and the strain from high-temperature linearities, 4-6 appearance of diffuse neutron scattering, 7 quasielastic central peaks ͑CPs͒ observed in the light scattering spectrum, 8 etc. The estimated T B of SBN-61 is in the range of 620-750 K. [4][5][6] Inelastic Brillouin light scattering can be a very useful tool for probing the dynamics of PNRs because the characteristic time scale of CPs related to the dynamics of PNRs can be located in the Brillouin frequency window. Jiang et al 9 reported detailed Brillouin study on SBN-61 including polarization analysis of acoustic modes and quasielastic CPs.…”

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Intrinsic and extrinsic central peaks in the Brillouin light scattering spectrum of the uniaxial ferroelectric relaxor Sr0.61Ba0.39Nb2O6

Kojima

2007

Applied Physics Letters

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Broadband Brillouin scattering of Sr0.61Ba0.39Nb2O6 uniaxial ferroelectric relaxors has been investigated. One broader central peak (CP) appeared at all temperatures and was ascribed to light-induced charge carriers, while the other narrower CP began to appear near the Burns temperature suggesting its origin from the formation of polar nanoregions. Temperature evolution of both CPs indicated one characteristic temperature near 450K at which the volume and/or density of polar clusters with broken inversion symmetry began to increase resulting in a substantial increase of the intensities of both CPs and coupling between them.

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Phase transitions in

Cited by 92 publications

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The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution

The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution

Polarization-Based Adjustable Memory Behavior in Relaxor Ferroelectrics

Intrinsic and extrinsic central peaks in the Brillouin light scattering spectrum of the uniaxial ferroelectric relaxor Sr0.61Ba0.39Nb2O6

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Phase transitions in

Cited by 92 publications

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The modulated structure of Ba0.39Sr0.61Nb2O6. I. Harmonic solution

The modulated structure of Ba0.39Sr0.61Nb2O6. I. Harmonic solution

Polarization-Based Adjustable Memory Behavior in Relaxor Ferroelectrics

Intrinsic and extrinsic central peaks in the Brillouin light scattering spectrum of the uniaxial ferroelectric relaxor Sr0.61Ba0.39Nb2O6

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The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution

The modulated structure of Ba_0.39Sr_0.61Nb₂O₆. I. Harmonic solution