Dynamic Polar Nanoregions and Broken Local Symmetry in Relaxor Ferroelectrics Probed by Inelastic Light Scattering

Kojima, Seiji; Ohta, Ryu; Ariizumi, Takuma; Zushi, Junta

doi:10.1088/1742-6596/428/1/012027

Cited by 15 publications

(13 citation statements)

References 24 publications

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“…The average size of these local regions is in the nanoscale, hence they are usually called polar nanoregions (PNRs). As widely reported, PNRs have been observed in paraelectric KTN crystals near the para-ferroelectric phase boundary1415. When the temperature decreases to the Burns temperature T B , the dipole moments induced by the B site off-centered Nb ions become correlated.…”

mentioning

confidence: 58%

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

Tian

Yao

Wang

et al. 2015

Sci Rep

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The dynamic response of polar nanoregions under an AC electric field was investigated by measuring the frequency dependence of the quadratic electro-optic (QEO) effect in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary (0 °C < T-Tc < 13 °C). The QEO coefficient R11 − R12 reached values as large as 5.96 × 10−15 m2/V2 at low frequency (500 Hz) and gradually decreased to a nearly stable value as the frequency increased to 300 kHz. Furthermore, a distortion of the QEO effect was observed at low frequency and gradually disappeared as R11 − R12 tended towards stability. The giant QEO effect in the KTa0.61Nb0.39O3 crystal was attributed to the dynamic rearrangement of polar nanoregions and its anomalous distortion can be explained by considering the asymmetric distribution of polar nanoregions.

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confidence: 58%

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

Tian

Yao

Wang

et al. 2015

Sci Rep

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“…Relaxor ferroelectrics also have diffuse phase transitions and increased Raman activity due to relaxation of Raman selection rules. [8] A previous x-ray diffraction study suggested a paraelectric Pm3m phase of PFN above T C = 376 K, and a ferroelectric tetragonal phase in the temperature range 355-376 K with an assignment of P4mm. [9,10] A Neel temperature of 153 K for the antiferromagnetic to paramagnetic transition suggests a phase stable at ambient pressure between between 153 and 355 K, which has generated strong debate.…”

Section: Introductionmentioning

confidence: 88%

High P–T Raman study of transitions in relaxor multiferroic Pb(Fe_0.5Nb_0.5)O₃

Wilfong

Ahart

Gramsch

et al. 2015

J Raman Spectroscopy

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The vibrational and structural properties of Pb(Fe 0.5 Nb 0.5 )O 3 have been investigated using Raman spectroscopy up to 40 GPa at 300 K and from 300 to 415 K at selected pressures. The measurements reveal three phase transitions, at 5.5, 8.7, and 24 GPa at room temperature. The temperature dependences of the spectra indicate transitions at 1.5 GPa, at 335 and 365 K. The results are consistent with the appearance of an intermediate tetragonal P4mm phase between the ferroelectric R3m and paraelectric Pm-3m phases. A P-T phase diagram is proposed that allows further insight into the magnetoelectric coupling present in this material.

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“…Additionally, we observe an intermediate temperature (T n ) in the paraelectric state, where the deviation starts between heating and cooling cycles. This could be associated with the beginning of local symmetry breaking [29]. During the heating process, the reorientation and arrangement of PNRs occurs.…”

Section: Resultsmentioning

confidence: 98%

Grain size dependent phase transition and superparaelectric behavior of ferroelectric BST

Mondal

Murty

Murthy

2015

Physica B: Condensed Matter

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Dynamic Polar Nanoregions and Broken Local Symmetry in Relaxor Ferroelectrics Probed by Inelastic Light Scattering

Cited by 15 publications

References 24 publications

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

High P–T Raman study of transitions in relaxor multiferroic Pb(Fe_0.5Nb_0.5)O₃

Grain size dependent phase transition and superparaelectric behavior of ferroelectric BST

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Dynamic Polar Nanoregions and Broken Local Symmetry in Relaxor Ferroelectrics Probed by Inelastic Light Scattering

Cited by 15 publications

References 24 publications

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

Dynamic response of polar nanoregions under an electric field in a paraelectric KTa0.61Nb0.39O3 single crystal near the para-ferroelectric phase boundary

High P–T Raman study of transitions in relaxor multiferroic Pb(Fe0.5Nb0.5)O3

Grain size dependent phase transition and superparaelectric behavior of ferroelectric BST

Contact Info

Product

Resources

About

High P–T Raman study of transitions in relaxor multiferroic Pb(Fe_0.5Nb_0.5)O₃