K0.9982Li0.0018TaO3Crystal Under External DC Electric Field

The results of low-temperature linear and nonlinear susceptibilities, polarization measurements and the dc electric field dependence of the dielectric properties of the lithium-doped potassium tantalate K 1-x Li x TaO 3 , x D 0.034 (KLT-3.4%Li) solid solution are presented. The coexistence of the relaxor-like and ferroelectric behavior and different mechanisms leading to either of them are discussed. The observed ferroelectric phase transition is of the first-order type with temperature hysteresis. This transition is due to the off-center motions of Ta ions in the octahedral environment of oxygen ions. Clusters of Li C ions produce a relaxor-like behavior and random electric field. This field reduces the depolarization field and allows off-center motions of Ta ions and an appearance of spontaneous polarization.

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Dielectric Response of KTaO3 Single Crystals Weakly Co-Doped with Li and Mn

Tkach

Złotnik

Vilarinho

2021

Crystals

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Alkali tantalates are encouraging functional materials with versatile properties that make them potential players in microelectronics, photocatalytic processes or medicine. Here, KTaO3 single crystals with 0.27% Li and 0.15% or 0.31% Mn contents determined by inductively coupled plasma spectroscopy analysis are studied at low temperatures using dielectric spectroscopy in a frequency range of 102–106 Hz. Both Li and Mn doping are found to induce separate low-frequency dielectric relaxations of comparable strength in KTaO3. The relaxation dynamics follow the Arrhenius law with activation energy values of ~77 and 107 meV, attributing the relaxation origin to the dipoles formed by off-centre Li+K and Mn2+K ions, respectively.

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K_0.9982Li_0.0018TaO₃Crystal Under External DC Electric Field

Cited by 3 publications

References 30 publications

Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

Coexistence of the relaxor-like and ferroelectric behavior in K_1-xLi_xTaO₃

Dielectric Response of KTaO3 Single Crystals Weakly Co-Doped with Li and Mn

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K0.9982Li0.0018TaO3Crystal Under External DC Electric Field

Cited by 3 publications

References 30 publications

Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

Linear and nonlinear dielectric response of the first-order ferroelectric phase transition in K0.92Li0.08TaO3 under dc electric field

Coexistence of the relaxor-like and ferroelectric behavior in K1-xLixTaO3

Dielectric Response of KTaO3 Single Crystals Weakly Co-Doped with Li and Mn

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Product

Resources

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K_0.9982Li_0.0018TaO₃Crystal Under External DC Electric Field

Coexistence of the relaxor-like and ferroelectric behavior in K_1-xLi_xTaO₃