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

Tian, Hao; Yao, Bing; Wang, Lei; Tan, Ping‐Heng; Meng, Xiangda; Shi, Guang; Zhou, Zhongxiang

doi:10.1038/srep13751

Cited by 32 publications

(22 citation statements)

References 21 publications

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“…The Curie-Wiess constant was found to be 0.8 × 10 5 K and the Curie-Wiess temperature is 320˚C. These results suggest using Curie-Weiss modified [16].…”

Section: Resultssupporting

confidence: 51%

Synthesis, Structural and Dielectric Properties of SrBi1.8Ce0.2Ta2O9

Afqir¹,

Tachafine²,

Fasquelle³

et al. 2016

OJPC

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This Ce-doped strontium bismuth tantalate SrBi 1.8 Ce 0.2 Ta 2 O 9 was prepared by solid-state reaction. X-ray diffraction was used to determine the crystal structure of the powders. The Raman spectrum of SrBi 1.8 Ce 0.2 Ta 2 O 9 sample was measured to confirm X-ray diffraction result. The microstructure of ceramic was observed by Scanning Electron Microscope (SEM). The Temperature dependence of the dielectric properties of ceramic was investigated from the room temperature to 400˚C.

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“…The Curie-Wiess constant was found to be 0.8 × 10 5 K and the Curie-Wiess temperature is 320˚C. These results suggest using Curie-Weiss modified [16].…”

Section: Resultssupporting

confidence: 51%

Synthesis, Structural and Dielectric Properties of SrBi1.8Ce0.2Ta2O9

Afqir¹,

Tachafine²,

Fasquelle³

et al. 2016

OJPC

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“…Recently, the dynamic response of the PNRs under an electric field in the cubic phase of KTN was reported in Ref. 43. It is also expected that the restriction of the Nb ions to four sites results in a [100] time-averaged polarizations with the application of the sufficient applied field, and resulting in a crystal transforms into a lower tetragonal P4mm symmetry.…”

Section: Resultsmentioning

confidence: 99%

Fano resonance of Li-doped KTa1−xNbxO3 single crystals studied by Raman scattering

Rahaman

Imai

Sakamoto

et al. 2016

Sci Rep

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The enhancement of functionality of perovskite ferroelectrics by local structure is one of current interests. By the Li-doping to KTa1−xNbxO3 (KTN), the large piezoelectric and electro-optic effects were reported. In order to give new insights into the mechanism of doping, the microscopic origin of the Fano resonance induced by the local structure was investigated in 5%Li-doped KTN single crystals by Raman scattering. The coupling between the continuum states and the transverse optical phonon near 196 cm−1 (Slater mode) caused a Fano resonance. In the vicinity of the cubic-tetragonal phase transition temperature, TC-T = 31 °C, the almost disappearance of the Fano resonance and the remarkable change of the central peak (CP) intensity were observed upon heating. The local symmetry of the polar nanoregions (PNRs), which was responsible for the symmetry breaking in the cubic phase, was determined to E(x, y) symmetry by the angular dependence of Raman scattering. The electric field induced the significant change in the intensity of both CP and Fano resonance. From these experimental results, it is concluded that the origin of the Fano resonance in Li-doped KTN crystals is the coupling between polarization fluctuations of PNRs and the Slater mode, both belong to the E(x, y) symmetry.

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“…Visible-light propagation reveals a polarization super-crystal with a micrometric lattice constant, a counterintuitive mesoscopic phase that naturally mimics standard solid-state structures but on scales that are thousands of times larger. The phenomenon is achieved using compositionally disordered ferroelectrics 18 19 20 21 22 23 24 25 26 27 . At one given temperature, these have the interesting property of manifesting a single perovskite phase whose dielectric properties depend on the specific composition 28 29 30 .…”

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confidence: 99%

Super-crystals in composite ferroelectrics

et al. 2016

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As atoms and molecules condense to form solids, a crystalline state can emerge with its highly ordered geometry and subnanometric lattice constant. In some physical systems, such as ferroelectric perovskites, a perfect crystalline structure forms even when the condensing substances are non-stoichiometric. The resulting solids have compositional disorder and complex macroscopic properties, such as giant susceptibilities and non-ergodicity. Here, we observe the spontaneous formation of a cubic structure in composite ferroelectric potassium–lithium–tantalate–niobate with micrometric lattice constant, 104 times larger than that of the underlying perovskite lattice. The 3D effect is observed in specifically designed samples in which the substitutional mixture varies periodically along one specific crystal axis. Laser propagation indicates a coherent polarization super-crystal that produces an optical X-ray diffractometry, an ordered mesoscopic state of matter with important implications for critical phenomena and applications in miniaturized 3D optical technologies.

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

Cited by 32 publications

References 21 publications

Synthesis, Structural and Dielectric Properties of SrBi<sub>1.8</sub>Ce<sub>0.2</sub>Ta<sub>2</sub>O<sub>9</sub>

Synthesis, Structural and Dielectric Properties of SrBi<sub>1.8</sub>Ce<sub>0.2</sub>Ta<sub>2</sub>O<sub>9</sub>

Fano resonance of Li-doped KTa1−xNbxO3 single crystals studied by Raman scattering

Super-crystals in composite ferroelectrics

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

Cited by 32 publications

References 21 publications

Synthesis, Structural and Dielectric Properties of SrBi&lt;sub&gt;1.8&lt;/sub&gt;Ce&lt;sub&gt;0.2&lt;/sub&gt;Ta&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt;

Synthesis, Structural and Dielectric Properties of SrBi&lt;sub&gt;1.8&lt;/sub&gt;Ce&lt;sub&gt;0.2&lt;/sub&gt;Ta&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt;

Fano resonance of Li-doped KTa1−xNbxO3 single crystals studied by Raman scattering

Super-crystals in composite ferroelectrics

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Synthesis, Structural and Dielectric Properties of SrBi<sub>1.8</sub>Ce<sub>0.2</sub>Ta<sub>2</sub>O<sub>9</sub>

Synthesis, Structural and Dielectric Properties of SrBi<sub>1.8</sub>Ce<sub>0.2</sub>Ta<sub>2</sub>O<sub>9</sub>