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Features of the Manifestation of Surface Electrochemical Processes in Ferroelectric Crystals with Low-Temperature Phase Transitions

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Abstract

The short-circuit current flow in crystals with the low-temperature phase transitions including Rochelle salt NaKC4H4O6 · 4H2O and triglycine sulfate (CH2 · NH2 · COOH)3 · H2SO4 is investigated. The experiments are conducted on polar cut samples without preliminary polarization with the symmetric indium conducting coatings. The short-circuit currents remaining for a fairly a long time and the current decay with time are observed at room temperature on all the samples. The temperature dependences of the short-circuit currents in the temperature ranges of 16 to 45°С for Rochelle salt and 16–110°С for triglycine sulfate are obtained. The short-circuit currents are observed in these crystals both in the ferroelectric and paraphase. It is shown that, upon heating in the ferroelectric phase, the total short-circuit current is determined by competing processes: the pyroelectric currents and electrochemical decomposition currents. In the paraphase, the short-circuit currents are the electrochemical self-decomposition currents. Based on the experimental results obtained, it is demonstrated that the short-circuit current flow through the polar cut samples of Rochelle salt and triglycine sulfate crystals is induced by the intrinsic emf caused by the electrochemical self-decomposition of the opposite surfaces of the sample polar cuts when in contact with the conducting coatings due to the anisotropy of these surfaces. A model of the electrochemical self-decomposition in such crystals is proposed.

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ACKNOWLEDGMENTS

This study was carried out at the Interdepartmental Educational Testing Laboratory of Semiconductor Materials and Dielectrics “Single Crystals and Stock on their Base,” National University of Science and Technology MISIS.

Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation through state assignment nos. 3.2794.2017/4.6, 11.5583.2017/ITR (11.5583.2017/7.8), and 11.6181.2017/ITR (11.6181.2017/7.8) to the university.

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Authors and Affiliations

  1. National University of Science and Technology MISIS, 119049, Moscow, Russia

    N. S. Kozlova, E. V. Zabelina, M. B. Bykova & A. P. Kozlova

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  1. N. S. Kozlova
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  2. E. V. Zabelina
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  3. M. B. Bykova
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  4. A. P. Kozlova
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Correspondence to N. S. Kozlova.

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Translated by E. Bondareva

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Kozlova, N.S., Zabelina, E.V., Bykova, M.B. et al. Features of the Manifestation of Surface Electrochemical Processes in Ferroelectric Crystals with Low-Temperature Phase Transitions. Russ Microelectron 48, 545–552 (2019). https://doi.org/10.1134/S1063739719080092

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