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A Study of Electrical Characteristics of Crystals of Homogeneously Doped LiNbO3:Zn,Mg in the Temperature Range of 450–900 K

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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*).

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Funding

This study was performed within the framework of a state order of the Ministry of Science and Higher Education of the Russian Federation (research topic no. 0226-2018-0004, state registration no. AAAA-A18-118022190125-2) and partially supported by the Russian Foundation for Basic Research (grant no. 18-03-00231-a).

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Federal Research Center Kola Scientific Center, Russian Academy of Sciences, 184206, Apatity, Russia

    M. N. Palatnikov, V. A. Sandler, N. V. Sidorov, S. M. Masloboeva & O. V. Makarova

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  1. M. N. Palatnikov
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  2. V. A. Sandler
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  3. N. V. Sidorov
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  4. S. M. Masloboeva
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  5. O. V. Makarova
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Correspondence to M. N. Palatnikov.

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Translated by O. Kadkin

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Palatnikov, M.N., Sandler, V.A., Sidorov, N.V. et al. A Study of Electrical Characteristics of Crystals of Homogeneously Doped LiNbO3:Zn,Mg in the Temperature Range of 450–900 K. Tech. Phys. 65, 1987–1993 (2020). https://doi.org/10.1134/S1063784220120208

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