The cluster glass route of relaxor ferroelectrics

Kleemann, W.; Dec, J.; Miga, S.

doi:10.1080/01411594.2014.976644

Cited by 22 publications

(20 citation statements)

References 42 publications

(66 reference statements)

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“…Due to heterovalent ions inside, typical lead-based relaxors are subject to random electric fields, which distort the orientation of dipoles. While the precise consequence of the random field is not all clear 13,14 , such distracting effect on dipoles appears to lead to a strongly modified phase transition with diffused and smeared peak, in sharp contrast to that of normal ferroelectrics 40,54 .…”

Section: B Pb-based Relaxorsmentioning

confidence: 98%

Insights into the dielectric response of ferroelectric relaxors from statistical modeling

Liu

Zeng

et al. 2017

Phys. Rev. B

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Ferroelectric relaxors are complex materials with distinct properties. The understanding of their dielectric susceptibility, which strongly depends on both temperature and probing frequency, has been a challenge to researchers for many years. Here we report a macroscopic and phenomenological approach based on statistical modeling to investigate how the dielectric response of a relaxor depends on temperature. Employing the MaxwellBoltzmann distribution and considering temperature dependent dipolar orientational polarizability, we propose a minimum statistical model and specific equations to understand and fit numerical and experimental dielectric responses versus temperature. We show that the proposed formula can successfully fit the dielectric response of typical relaxors, including Ba(Zr,Ti)O 3 , 0.87Pb(Zn 1/3 Nb 2/3 ) 0.87 O 3 -0.13PbTiO 3 , 0.95Pb(Mg 1/3 Nb 2/3 )O 3 -0.05Pb(Zr 0.53 Ti 0.47 )O 3 , and Bi-based compounds, which demonstrate the general applicability of this approach.

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Section: B Pb-based Relaxorsmentioning

confidence: 98%

Insights into the dielectric response of ferroelectric relaxors from statistical modeling

Liu

Zeng

et al. 2017

Phys. Rev. B

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“…Recently, Kleemann et al . 43, 70, 73 observed similar effects not only in heterovalent (SBN75, PMN) systems with strong RFs, but also in isovalent BaTi 1− x Zr x O 3 ( x = 0.35, BTZ35) with weak RFs. They also proposed that these effects might be a universal signature of all REFs 73 .…”

Section: Resultsmentioning

confidence: 72%

“…On field heating (FH) from T = 25 °C under 3.0 kV/cm, a broad and weak anomaly in V LA around 50 °C was observed. It suggests an incomplete alignment of nanodomains due to the interaction between PNRs 43, 68 . Upon further heating, a sharp and small increase in V LA around 149 °C (inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Aging is a universal phenomenon in disordered systems such as spin glasses, super-cooled liquids, polymers, and REFs 42 . Aging of the susceptibility components of highly disordered SBN75 with strong RFs shows rejuvenation and memory effects, which indicate the possible glassy nature of the low-temperature ground state 43, 44 . The compositional inhomogeneity in the nanoscale regions of these crystals induces the RFs, which cause a diffused phase transition and the formation of nanodomain structure below T C , while the growth of the macro/single domain state is restricted by RFs 39 .…”

Section: Introductionmentioning

confidence: 99%

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Electric field and aging effects of uniaxial ferroelectrics Sr x Ba1−x Nb2O6 probed by Brillouin scattering

Aftabuzzaman

Helal

Paszkowski

et al. 2017

Sci Rep

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Static and dynamic heterogeneity of disordered system is one of the current topics in materials science. In disordered ferroelectric materials with random fields, dynamic polar nanoregions (PNRs) appear at Burns temperature and freeze into nanodomain state below Curie temperature (T C). This state is very sensitive to external electric field and aging by which it gradually switches into macrodomain state. However, the role of PNRs in such states below T C is still a puzzling issue of materials science. Electric field and aging effects of uniaxial ferroelectric SrxBa1−xNb2O6 (x = 0.40, SBN40) single crystals were studied using Brillouin scattering to clarify the critical nature of PNRs in domain states below T C. On field heating, a broad anomaly in longitudinal acoustic (LA) velocity at low temperature region was due to an incomplete alignment of nanodomains caused by the interaction between PNRs. A sharp anomaly near T C was attributed to the complete switching of nanodomain to macrodomain state owing to the lack of interaction among PNRs. After isothermal aging below T C, the noticeable increase of LA velocity was observed. It was unaffected by cyclic temperature measurements up to T C, and recovered to initial state outside of a narrow temperature range above and below aging temperature.

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“…In some earlier reports, the existence of PNRs in RFEs has already been verified experimentally [9][10][11][12][13][14] and also explained the mechanism behind their formation employing different models. [14][15][16][17][18] However, a conclusive understanding of the physics defining RFEs is still lacking and needs further attention.…”

Section: Introductionmentioning

confidence: 99%

Low temperature Raman scattering study of barium doped lead ytterbium tantalate ceramics

et al. 2017

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Raman spectra of a complex perovskite system (Pb 1Àx Ba x Þ(Yb 0:5 Ta 0:5 )O 3 , x ¼ 0:0; 0:1 and 0.2 have been studied at low temperature in the range of 10-250 K. The fascination of the system is that it undergoes a crossover from a highly ordered antiferroelectric (x ¼ 0:0) to ferroelectric (x ¼ 0:1) to disordered relaxor ferroelectric (x ¼ 0:2). The nature of splitting that prevails in F 2g (% 60 cm À1 ), F 1g (% 538 cm À1 ) modes and their gradual merging and disappearance with x indicates an orthorhombic symmetry for x ¼ 0:0 and a pseudo-cubic structure for x ¼ 0:2. The mode at 420 cm À1 suggests the existence of rhombohedral distortion in all the compositions. The soft mode behavior of the F 2g modes has been analyzed by fitting the data with the power law ! s ¼ AðT C À TÞ .

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The cluster glass route of relaxor ferroelectrics

Cited by 22 publications

References 42 publications

Insights into the dielectric response of ferroelectric relaxors from statistical modeling

Insights into the dielectric response of ferroelectric relaxors from statistical modeling

Electric field and aging effects of uniaxial ferroelectrics Sr x Ba1−x Nb2O6 probed by Brillouin scattering

Low temperature Raman scattering study of barium doped lead ytterbium tantalate ceramics

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