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- Title
A comparative study of the electrical properties of reduced and unreduced LiTaO crystals.
- Authors
Palatnikov, M.; Yatsenko, A.; Sandler, V.; Sidorov, N.; Ivanenko, D.; Makarova, O.
- Abstract
We have carried out a comparative study of the electrical properties of lithium tantalate (LiTaO) crystals in a wide temperature range (300-900 K) before and after reductive treatment in HO vapor and subsequent oxidative annealing. The results demonstrate that, in the temperature range of Li ion conduction (550-900 K), the activation enthalpy for ionic conduction in the reduced lithium tantalate crystal is H = 1.37 eV, which slightly exceeds that in the initial state of the crystal (1.34 eV). In the temperature range 390-450 K, the σ( T) data for the unannealed crystal are well represented by the Arrhenius law in the presence of two carrier types, with activation energies E = 1.03 eV and E = 0.29 eV, characteristic of proton and electron hopping conduction, respectively. After reductive annealing, the activation energy for conduction is ~0.65 eV, characteristic of the activation energy for bipolaron conduction. After subsequent oxidative annealing of the reduced crystals in dry air, the activation energy is ~1.2 eV. It seems likely that the presence of oxygen vacancies in the reduced LiTaO crystal stimulates hydrogen release from the crystal during oxidative annealing.
- Subjects
LITHIUM tantalate; ELECTRIC properties; TEMPERATURE; CHEMICAL reduction; ANNEALING of crystals; IONIC conductivity
- Publication
Inorganic Materials, 2017, Vol 53, Issue 6, p576
- ISSN
0020-1685
- Publication type
Article
- DOI
10.1134/S0020168517060152