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Title: Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal

Abstract

Low-frequency dielectric dispersion phenomena in a LiTaO{sub 3}-type single crystal have been analyzed by impedance spectroscopy in directions parallel and perpendicular to the polar c-axis (rhombohedral system). An empirical expression has been deduced for the complex permittivity {epsilon}*({omega}), {epsilon}*({omega}) = {epsilon}{infinity} + {sup {epsilon}{sub s}-{epsilon}{infinity}}/{sub 1 + (i{omega}/{omega}{sub 1}){sup m}} + {sup {sigma}{sub 0}}/{sub {epsilon}{sub 0}{omega}} [1 + (i{omega}/{omega}{sub 2}){sup n}], where the ({omega}{sub 1}, m) and ({omega}{sub 2}, n) couples characterize respectively the lattice and the charge carrier responses. This relation may be considered as a generalization of the Cole-Cole dielectric expression. Excellent agreement has been obtained in a wide frequency domain (1-10{sup 6} Hz) between the measured and calculated permittivities in the 500-650{degrees}C temperature range ({Tc} = 600{degrees}C). The temperature dependence of various dielectrical parameters has been determined and discussed. The relaxations are correlated to Li atom motions.

Authors:
; ; ;  [1];  [2]
  1. Universite de Bordeaux I, Talence (France)
  2. KIST, Seoul (Korea, Democratic People`s Republic of)
Publication Date:
OSTI Identifier:
70194
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 116; Journal Issue: 1; Other Information: PBD: Apr 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LITHIUM OXIDES; PERMITTIVITY; TANTALUM OXIDES; TRIGONAL LATTICES; ELECTRIC IMPEDANCE; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; MATHEMATICAL MODELS

Citation Formats

Ming, D., Reau, J.M., Ravez, J., Hagenmuller, P., and Gitae, J. Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal. United States: N. p., 1995. Web. doi:10.1006/jssc.1995.1200.
Ming, D., Reau, J.M., Ravez, J., Hagenmuller, P., & Gitae, J. Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal. United States. doi:10.1006/jssc.1995.1200.
Ming, D., Reau, J.M., Ravez, J., Hagenmuller, P., and Gitae, J. Sat . "Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal". United States. doi:10.1006/jssc.1995.1200.
@article{osti_70194,
title = {Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal},
author = {Ming, D. and Reau, J.M. and Ravez, J. and Hagenmuller, P. and Gitae, J.},
abstractNote = {Low-frequency dielectric dispersion phenomena in a LiTaO{sub 3}-type single crystal have been analyzed by impedance spectroscopy in directions parallel and perpendicular to the polar c-axis (rhombohedral system). An empirical expression has been deduced for the complex permittivity {epsilon}*({omega}), {epsilon}*({omega}) = {epsilon}{infinity} + {sup {epsilon}{sub s}-{epsilon}{infinity}}/{sub 1 + (i{omega}/{omega}{sub 1}){sup m}} + {sup {sigma}{sub 0}}/{sub {epsilon}{sub 0}{omega}} [1 + (i{omega}/{omega}{sub 2}){sup n}], where the ({omega}{sub 1}, m) and ({omega}{sub 2}, n) couples characterize respectively the lattice and the charge carrier responses. This relation may be considered as a generalization of the Cole-Cole dielectric expression. Excellent agreement has been obtained in a wide frequency domain (1-10{sup 6} Hz) between the measured and calculated permittivities in the 500-650{degrees}C temperature range ({Tc} = 600{degrees}C). The temperature dependence of various dielectrical parameters has been determined and discussed. The relaxations are correlated to Li atom motions.},
doi = {10.1006/jssc.1995.1200},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 116,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 1995},
month = {Sat Apr 01 00:00:00 EST 1995}
}