Origin of the crossover between a freezing and a structural transition at low concentration in the relaxor ferroelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Li</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">TaO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Cai, Ling; Toulouse, J.; Harriger, Leland; Downing, R. G.; Boatner, L. A.

doi:10.1103/physrevb.91.134106

Cited by 12 publications

(9 citation statements)

References 33 publications

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“…In the vicinity of the melting point, an increase in relaxation time while approaching the phase transition temperature (an increase in relaxation time with an increase of temperature) was observed. An increase in relaxation time in the vicinity of phase transition has already been observed, a phenomenon known as “critical slowing down”. − In the case of nonanol and dodecanol, relaxation times were obtained with larger error, making such an analysis impossible.…”

Section: Resultsmentioning

confidence: 99%

Premelting Phenomena in n-Alcohols from Nonanol to Dodecanol

et al. 2020

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The nonlinear dielectric effect (NDE) measurements of nonanol, undecanol, and dodecanol in the vicinity of the melting point were performed to examine and to develop the hypothesis on pretransition phenomena in decanol (Pocheć et all, J. Phys. Chem. C 2019, 123, 16929–16933). The results show that the anomalous increase of the nonlinear dielectric effect in the immediate vicinity of the melting point is uniform for each of the studied compounds. We link the observed anomaly with the formation of a liquidlike film on the surface of the solid. The scaling function describing these anomalies was proposed and tested. We proved the feasibility of NDE studies in the examination of premelting phenomena.

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Section: Resultsmentioning

confidence: 99%

Premelting Phenomena in n-Alcohols from Nonanol to Dodecanol

et al. 2020

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“…In K 1- y Li y TaO 3 (KLT) and K 1- z Li z NbO 3 (KLN), the substitutional Li ions occupy one of six off-center sites along the [100] directions at the A-site1920, which can lead to the formation of random fields that enhance the appearance of PNRs. In KLT, there is a crossover at around critical concentration y = 0.022 between a freezing and a structural transition with a critical level of local polarization19. Most recently, Rahaman et al observed the effects of Li-doping on elastic properties, which enhanced the relaxor nature by the growth of PNRs of KTN21.…”

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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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“…( 23) to the data displayed in Fig. 17 some authors indicate as a glassy state [129,131,133]. This PNRs configuration continuously evolves and below the FE peak they form large polarized domains giving rise to the ferroelectric arrangement of the tetragonal phase (paraelectric to ferroelectric transition) [134].…”

Section: Phase Transitionsmentioning

confidence: 80%

Comprehensive review on Froehlich entropy estimation: a technique to investigate the state of order in condensed matter

Parravicini¹,

Parravicini²

2021

Preprint

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The so-called Fröhlich entropy is the entropy variation of a material under the application of an electric field. This quantity can be calculated, under suitable hypotheses, directly from the measured real part of the dielectric function. Although Fröhlich entropy is defined for a biased sample, a straightforward physical interpretation correlates it to the state of order of the considered physical system in absence of field. When Fröhlich entropy is calculated from experimental results, its trend is able to give several information about the evolution in temperature of the explored compound, especially of its phase transition features. We here provide a comprehensive review of the physical systems (dipolar liquids and nematicons, organic molecular crystals, metallic nanoparticles, inorganic disordered ferroelectrics, etc.) where this approach has been exploited with the aim of evaluating their state of order. The variety of compounds where this method has been applied demonstrates that the estimation of the Fröhlich entropy can be considered

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Origin of the crossover between a freezing and a structural transition at low concentration in the relaxor ferroelectricK1−xLixTaO3

Cited by 12 publications

References 33 publications

Premelting Phenomena in n-Alcohols from Nonanol to Dodecanol

Premelting Phenomena in n-Alcohols from Nonanol to Dodecanol

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

Comprehensive review on Froehlich entropy estimation: a technique to investigate the state of order in condensed matter

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