Analysis of the nature of electrical conductivity in nominally undoped LiNbO{sub 3} crystals

The temperature dependence of electrical conductivity and admittance of two nominally undoped lithium niobate crystals of congruent composition has been investigated in the temperature range of 293–450 K and simulated in the range of 350–700 K. It is shown that the ion conductivity at T < 450 K i...

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Bibliographic Details
Published in:Crystallography reports 2015-03, Vol.60 (2)
Main Authors: Pritulenko, A. S., Yatsenko, A. V., Yevdokimov, S. V.
Format: Article
Language:English
Subjects:
ACTIVATION ENERGY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
DIFFUSION
IONIC CONDUCTIVITY
LITHIUM
LITHIUM COMPOUNDS
NIOBATES
NIOBIUM OXIDES
OXYGEN
TEMPERATURE DEPENDENCE
VACANCIES
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Summary:The temperature dependence of electrical conductivity and admittance of two nominally undoped lithium niobate crystals of congruent composition has been investigated in the temperature range of 293–450 K and simulated in the range of 350–700 K. It is shown that the ion conductivity at T < 450 K is mainly determined by OH{sup −} groups; however, some other mechanisms may manifest themselves at higher temperatures; a likely one is diffusion of oxygen vacancies, which leads to an increase in the “averaged” conductivity activation energy.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774515020224