Dielectric properties of K1-xLixTa1-yNby O3 crystals

Gabby Bitton; Yuri Feldman; Aharon J. Agranat

doi:10.1080/00150190008213325

Dielectric properties of K_1-xLi_xTa_1-yNb_y O₃ crystals

Gabby Bitton^*, Yuri Feldman, Aharon J. Agranat

^*Corresponding author for this work

Department of Applied Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The dielectric properties of K_1-xLi_xTa_1-yNb_yO₃ (KLTN) crystals as functions of the frequency, temperature and electric field are presented. The dielectric measurement were conducted on several crystals with moderate Nb concentration, 10%-40% and small Li concentration, <1%. In this article we present the results for two representative samples, one with 16% of Nb and 0.8% of Li and the other with 36% of Nb and 0.6% of Li. The dielectric permitivity in the vicinity of the phase transition in the sample with 16% of Nb increases when an electric field is applied. This increase is connected with the sign change from positive to negative of γ, the coefficient of P⁴ in the free energy function. This result suggests that the phase transition in KLTN crystal is first order phase transition. A relaxation process with activation energy of 0.107eV and a high temperature frequency of 3×10¹¹ Hz was found. This relaxation process was attributed to Li 90° flips.

Original language	English
Pages (from-to)	213-224
Number of pages	12
Journal	Ferroelectrics
Volume	239
Issue number	1-4
DOIs	https://doi.org/10.1080/00150190008213325
State	Published - 2000

Keywords

Dielectric properties
Ktnili
Off-center impurities
Phase transition

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10.1080/00150190008213325

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title = "Dielectric properties of K1-xLixTa1-yNby O3 crystals",

abstract = "The dielectric properties of K1-xLixTa1-yNbyO3 (KLTN) crystals as functions of the frequency, temperature and electric field are presented. The dielectric measurement were conducted on several crystals with moderate Nb concentration, 10%-40% and small Li concentration, <1%. In this article we present the results for two representative samples, one with 16% of Nb and 0.8% of Li and the other with 36% of Nb and 0.6% of Li. The dielectric permitivity in the vicinity of the phase transition in the sample with 16% of Nb increases when an electric field is applied. This increase is connected with the sign change from positive to negative of γ, the coefficient of P4 in the free energy function. This result suggests that the phase transition in KLTN crystal is first order phase transition. A relaxation process with activation energy of 0.107eV and a high temperature frequency of 3×1011 Hz was found. This relaxation process was attributed to Li 90° flips.",

keywords = "Dielectric properties, Ktnili, Off-center impurities, Phase transition",

author = "Gabby Bitton and Yuri Feldman and Agranat, {Aharon J.}",

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doi = "10.1080/00150190008213325",

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T1 - Dielectric properties of K1-xLixTa1-yNby O3 crystals

AU - Bitton, Gabby

AU - Feldman, Yuri

AU - Agranat, Aharon J.

PY - 2000

Y1 - 2000

N2 - The dielectric properties of K1-xLixTa1-yNbyO3 (KLTN) crystals as functions of the frequency, temperature and electric field are presented. The dielectric measurement were conducted on several crystals with moderate Nb concentration, 10%-40% and small Li concentration, <1%. In this article we present the results for two representative samples, one with 16% of Nb and 0.8% of Li and the other with 36% of Nb and 0.6% of Li. The dielectric permitivity in the vicinity of the phase transition in the sample with 16% of Nb increases when an electric field is applied. This increase is connected with the sign change from positive to negative of γ, the coefficient of P4 in the free energy function. This result suggests that the phase transition in KLTN crystal is first order phase transition. A relaxation process with activation energy of 0.107eV and a high temperature frequency of 3×1011 Hz was found. This relaxation process was attributed to Li 90° flips.

AB - The dielectric properties of K1-xLixTa1-yNbyO3 (KLTN) crystals as functions of the frequency, temperature and electric field are presented. The dielectric measurement were conducted on several crystals with moderate Nb concentration, 10%-40% and small Li concentration, <1%. In this article we present the results for two representative samples, one with 16% of Nb and 0.8% of Li and the other with 36% of Nb and 0.6% of Li. The dielectric permitivity in the vicinity of the phase transition in the sample with 16% of Nb increases when an electric field is applied. This increase is connected with the sign change from positive to negative of γ, the coefficient of P4 in the free energy function. This result suggests that the phase transition in KLTN crystal is first order phase transition. A relaxation process with activation energy of 0.107eV and a high temperature frequency of 3×1011 Hz was found. This relaxation process was attributed to Li 90° flips.

KW - Dielectric properties

KW - Ktnili

KW - Off-center impurities

KW - Phase transition

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ER -

Dielectric properties of K_1-xLi_xTa_1-yNb_y O₃ crystals

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Keywords

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