1993
DOI: 10.1209/0295-5075/24/5/016
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Dielectric Study of the Phase Transition in K 1− x Li x TaO 3

Abstract: Comprehensive dielectric measurements have been performed on the mixed-crystal system K1−xLixTaO3 in order to check the hypotheses done about the ferroelectric and the dipole glass behaviours and identify their respective origins. These have been made for a series of concentrations (1.5% < x < 5%), spanning the critical concentration xc ≅ 2%, and over the frequency range from 20 Hz to 2 MHz. The broad frequency and temperature ranges have allowed us to cover, in the same study, both Li-related dielectric relax… Show more

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Cited by 29 publications
(31 citation statements)
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“…10 An activation energy inside that range is obtained in the current work for KLT with x = 0.02, revealing that relaxation B in this composition stems from the flipping of Li + K pairs. Regarding the fitting of the Vogel-Fulcher relation to the high-T experimental data in KLT ceramics with x = 0.05 and 0.10, the relaxation parameters obtained evidence the apparent off-centre displacements of small lithium ions on the large potassium sites within polar clusters.…”
Section: B Analysis Of the Dielectric Relaxations Of K 1-x LI X Tio supporting
confidence: 54%
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“…10 An activation energy inside that range is obtained in the current work for KLT with x = 0.02, revealing that relaxation B in this composition stems from the flipping of Li + K pairs. Regarding the fitting of the Vogel-Fulcher relation to the high-T experimental data in KLT ceramics with x = 0.05 and 0.10, the relaxation parameters obtained evidence the apparent off-centre displacements of small lithium ions on the large potassium sites within polar clusters.…”
Section: B Analysis Of the Dielectric Relaxations Of K 1-x LI X Tio supporting
confidence: 54%
“…These two peaks have been associated with two distinct relaxational processes, termed low-T and high-T relaxations. [9][10][11] The low-T process with an activation energy of 78<U<125 meV has been associated with isolated Li ions hopping from one <001> position to another. 12 However, the high-T process with an activation energy of 181<U<241 meV is poorly understood.…”
Section: Introductionmentioning
confidence: 99%
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“…On cooling, the interactions between the dipoles are believed to result in polar nanoregions [1,2], although the nature of polar nanoregions is probably different from those found in relaxors with strong random fields [17]. For 0 ox o2.2%, the crystal remains in the cubic phase down to T-0 K, and the classic relaxor-like behavior is observed in dielectric susceptibility below 100 K [18,19]. A ferroelectric transition is found at low-temperature for x4 2.2%, but the frequency dependence in dielectric susceptibility persists at least up to x E5% [18,20].…”
Section: Resultsmentioning
confidence: 99%
“…Typical data of the real and imaginary parts of the dielectric constant [3] at several frequencies and of the real and imaginary parts of the elastic constant [4] also at various frequencies are shown as a function of temperature for two KLT samples, one with x = 0.015 (figure 1) and the other with x = 0.05 (figure 2).…”
Section: Phase Transitionmentioning
confidence: 99%