Impedance spectroscopic studies on congruent LiNbO3 single crystal

R. H. Chen, Li Fang Chen, Chih Ta Chia

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Electrical impedance measurements on a congruent LiNbO3 single crystal were performed as a function of both temperature and frequency. The measurements were carried out in the directions along the c-and a-axes of the crystal. The temperature and frequency dependence of various dielectric properties have been studied. The result has revealed two remarkable dynamic relaxations: dielectric dipolar relaxation and ionic conductivity relaxation. The dipolar relaxation peaks were found at frequencies around 4 × 10 6 and 2 × 106Hz for the c-axis and a-axis, respectively, and they were only slightly temperature dependent. The ionic conductivity relaxation was found at the lower-frequency end but it was temperature dependent. The temperature dependence of the dc electrical conductivity follows the Arrhenius law. It corresponds to the long-range ionic motion of Li+ ions which are thermally activated with activation energy of 0.90 and 0.87eV along the c-and a-axis directions, respectively. The dc conductivities measured along the c-and a-axes are very close to each other, and the value increases from 1.7 × 10-6 to 1.9 × 10 -3Ω-1cm-1 as the temperature is raised from 300 to 700 °C. The sample crystal becomes an ionic conductor as the temperature is raised.

Original languageEnglish
Article number086225
JournalJournal of Physics Condensed Matter
Volume19
Issue number8
DOIs
Publication statusPublished - 2007 Feb 28

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Electric Impedance
Single crystals
impedance
Temperature
single crystals
ion currents
Ionic conductivity
temperature
conductivity
temperature dependence
impedance measurement
electrical impedance
crystals
Electric Conductivity
Crystals
dielectric properties
Acoustic impedance
Dielectric relaxation
conductors
Articular Range of Motion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Impedance spectroscopic studies on congruent LiNbO3 single crystal. / Chen, R. H.; Chen, Li Fang; Chia, Chih Ta.

In: Journal of Physics Condensed Matter, Vol. 19, No. 8, 086225, 28.02.2007.

Research output: Contribution to journalArticle

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