Magnetism and Ferroelectricity

Physics of the Solid State

, Volume 40, Issue 7, pp 1190-1192

First online:

Low-temperature electrical conductivity of congruent lithium niobate crystals

  • I. Sh. AkhmadullinAffiliated withKazan Physicotechnical Institute, Russian Academy of Sciences
  • , V. A. Golenishchev-KutuzovAffiliated withKazan Physicotechnical Institute, Russian Academy of Sciences
  • , S. A. MigachevAffiliated withKazan Physicotechnical Institute, Russian Academy of Sciences
  • , S. P. MironovAffiliated withKazan Physicotechnical Institute, Russian Academy of Sciences

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Abstract

The electrical conductivity of lithium niobate crystals was investigated at temperatures between 80 and 450 K as a function of the oxidation-reduction annealing conditions. The results are interpreted in terms of polaron electrical conductivity at room temperature and above. A reduction in the measurement temperature leads to “freezing out” of small-radius polarons, and hopping of Heitler-London bipolarons via unfilled NbLi sites becomes the main mechanism responsible for the electrical conductivity.