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The Effect of Mechanical Activation on the Conductivity in the System KNO3‒Al2O3

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Abstract

The effect of mechanical activation on the structure and conductivity of the KNO3–Al2O3 composite is considered. The analysis of DSC curves measured in the course of heating of the 0.5KNO3–0.5Al2O3 composite shows that the enthalpy of phase transitions decreases with the increase in the time of mechanical activation. Based on the X-ray diffraction analysis, it is shown that the mechanical activation reduces the grain size and makes the grains more defective. According to the data of electrochemical impedance spectroscopy, the ionic conductivity of the system KNO3–Al2O3 obtained by mechanical activation is 3.8 × 10–5 S/cm at T = 373 К and 2 × 10–3 S/cm at T = 473 К and its activation energy is 0.19 eV, which is comparable with the parameters of composites with the same chemical composition obtained by the ceramic method. The Raman spectroscopic study reveals the formation of the metastable γ-KNO3 phase in the system KNO3–Al2O3 at the temperature above 397 К. The increase in conductivity of the KNO3–Al2O3 composite at 373–403 К is associated with the presence of an additional metastable γ-KNO3 phase.

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ACKNOWLEDGMENTS

The study was carried out using the instruments of the Analytical Center of Collective Use of the Dagestan Federal Research Center of the Russian Academy of Sciences.

Funding

This study was financially supported by the Foundation for Assistance to Innovations (grant no. 4470GS1/72582 from February 15, 2022 (С1-112576)).

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Authors and Affiliations

  1. Analytical Center of Collective Use, of Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, Makhachkala, Russia

    M. A. Akhmedov, M. M. Gafurov, R. Sh. Rabadanov, M. B. Ataev, A. M. Amirov, Z. Yu. Kubataev & M. G. Kakagasanov

  2. Limited Liability Company “DAGLITHIUM”, Makhachkala, Russia

    M. A. Akhmedov

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  1. M. A. Akhmedov
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Correspondence to M. A. Akhmedov or R. Sh. Rabadanov.

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Translated by T. Safonova

Based on the materials of the 16th International Meeting “Fundamental Problems of Solid State Ionics”, Chernogolovka, June 27–July 3, 2022.

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Akhmedov, M.A., Gafurov, M.M., Rabadanov, R.S. et al. The Effect of Mechanical Activation on the Conductivity in the System KNO3‒Al2O3. Russ J Electrochem 59, 589–597 (2023). https://doi.org/10.1134/S1023193523080037

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