Nonlinear Dielectric Susceptibility in Pb(Sc 1/2 Ta 1/2 )O 3 Single Crystals

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The temperature dependence of the aging effect of permittivity in the paraelectric phase of 70.5%Pb(Mg1/3Nb2/3)O3–29.5%PbTiO3 (PMN–29.5%PT) is investigated. Time dependences of permittivity due to the aging effect at constant temperatures without DC biasing field can be empirically analyzed with the Williams–Watts relaxation function. Using the distribution function of relaxation frequency for the Williams–Watts relaxation function, we discuss the temperature dependence of the characteristic time of the aging effect. We clarify that the distribution width of the characteristic time markedly increases with decreasing temperature.

Section: Introductionmentioning

confidence: 99%

Temperature dependence of aging effect in Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ single crystal

Iwata

Okoshi

Suzuki

et al. 2022

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“…26) Dielectric nonlinearity with respect to ferroelectric phase transitions such as the dc field dependence of permittivity has attracted considerable attention from the perspective of basic research and practical applications. 28,29) Among various materials, those whose permittivity changes significantly in response to an external electric field are called tunable dielectric materials, and the relative dielectric tunability t for evaluating the tunable materials is defined as…”

Section: Introductionmentioning

confidence: 99%

Field-induced effects and ferroelectric critical endpoint in (K_0.95Li_0.05)(Nb_1–xTa_x)O₃ single crystals

Iwata,

Tagata,

Koketsu

et al. 2024

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Dielectric permittivities under dc biasing fields in the temperature range between –169 and 75°C have been investigated in (K0.95Li0.05)(Nb1–x Ta x )O3 (KLNT–x, x = 71 and 74%). Field-induced ferroelectric phase transitions in KLNT–x have been clarified in the dc field applied along the [001]c direction (in the cubic coordinate). The ferroelectric critical endpoints in KLNT–71% and KLNT–74% have been determined to be 43.5°C, 3.0 kV/cm, and 30.3°C, 2.0 kV/cm, respectively. The tricritical point at which the first-order phase transition changes to the second-order phase transition has been estimated at 10.4℃ and x = 77.4% in the temperature–concentration phase diagram. The field-induced phase transitions and dielectric tunabilities have been discussed on the basis of the Landau-type free energy density.

“…It does not seem, however, that these models can satisfactorily explain the experimental results for the diffuse phase transition in relaxors. [14][15][16] In particular, the models in which the dipole-glass phase transition occurs, such as the superparaelectric model 10) and the SRBRF model, 12) can predict that the third-order nonlinear permittivity, which is proportional to the cube of the field, diverges negatively. However, the third-order nonlinear permittivity of relaxors was reported to have both negative 14) and positive [15][16][17] values near the phase transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the aging effect of permittivity in Pb(Zn_1/3Nb_2/3)O₃–PbTiO₃ and BaTiO₃ single crystals

Iwata,

Saitoh,

Kotani

et al. 2023

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The temperature dependence of the aging effect of permittivity in the paraelectric phase of 95.5%Pb(Zn1/3Nb2/3)O3–4.5%PbTiO3 (PZN–4.5%PT) and BaTiO3 (BT) single crystals has been investigated. The time dependence of the real part of permittivity at constant temperatures has been found in the paraelectric phase not only in the relaxor ferroelectric PZN–4.5%PT, but also in the typical oxide ferroelectric BT. Such time dependence of permittivity can be empirically analyzed using the Kohlausch–Williams–Watts (KWW) relaxation function. We discuss the relationship between the aging effect and the relaxation process of the collective motion of polar nanoregions.