Dielectric properties of K1-xLixTa1-yNby O3 crystals

Gabby Bitton*, Yuri Feldman, Aharon J. Agranat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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.

Original languageAmerican English
Pages (from-to)213-224
Number of pages12
JournalFerroelectrics
Volume239
Issue number1-4
DOIs
StatePublished - 2000

Keywords

  • Dielectric properties
  • Ktnili
  • Off-center impurities
  • Phase transition

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