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- Title
A Study of Electrical Characteristics of Crystals of Homogeneously Doped LiNbO3:Zn,Mg in the Temperature Range of 450–900 K.
- Authors
Palatnikov, M. N.; Sandler, V. A.; Sidorov, N. V.; Masloboeva, S. M.; Makarova, O. V.
- Abstract
In a series of initially polydomain crystals of LiNbO3:Zn,Mg obtained by the homogeneous doping of the crystals in the concentration ranges of around 1 ± 0.02 mol % MgO and 3.0–4.6 mol % ZnO, abrupt increases in temperature dependences of electrical conductivity σ(T) and dielectric constant ε(T) with the manifestation of low-frequency dielectric dispersion are observed near T* ≈ 800 K. At T > T*, these crystals exhibit the activation enthalpy (Ha ≈ 1.76–2.07 eV) and transport enthalpy (Hm ≈ 1.55–2.01 eV) values that are unusually high for cationic conductors, while both values at T < T* are typical of conductivity caused by Li+ cations in LiNbO3 crystals (Ha ≈ 1.2–1.4 eV and Hm ≈ 1.1–1.28 eV). Anomalous increases in the Ha and Hm values for crystals with the LiNbO3 structure are apparently associated with the formation of associated vacancies (divacancies) with a finite binding energy and a pair-correlated hop of Li+ ions in the LiNbO3 : Zn,Mg crystals in the high-temperature region with increased conductivity (T > T*).
- Subjects
CRYSTALS; ELECTRIC conductivity; PERMITTIVITY; CRYSTAL structure; TEMPERATURE; DOPING agents (Chemistry); BINDING energy; ANOMALOUS Hall effect
- Publication
Technical Physics, 2020, Vol 65, Issue 12, p1987
- ISSN
1063-7842
- Publication type
Article
- DOI
10.1134/S1063784220120208