Impedance-spectroscopy analysis of a LiTaO{sub 3}-type single crystal
- Universite de Bordeaux I, Talence (France)
- KIST, Seoul (Korea, Democratic People`s Republic of)
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.
- OSTI ID:
- 70194
- Journal Information:
- Journal of Solid State Chemistry, Vol. 116, Issue 1; Other Information: PBD: Apr 1995
- Country of Publication:
- United States
- Language:
- English
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