Abstract—
The paper focuses on lanthanum cobaltite micropowders LaCoO3 – δ (LCO) synthesized by the sol-gel method using polyvinylpyrrolidone (PVP) as a gelling agent. The PVP content was varied from 0.5 to 5.0 wt % when ionic solutions of the soluble raw components were prepared. The gels were dried in a microwave oven at a microwave power of 90 W for 2 h to evaporate water. Xerogels were thermally treated in a muffle furnace at temperatures 800 and 900°C; the maximum holding time was 10 and 30 h. After heat treatment of xerogels at 800°C for 10 h, the LCO micropowders were slightly aggregated, the particle size was in the range from 0.24 to 0.38 μm, and the specific surface area was in the range from 2.60 to 4.10 m2/g. After heat treatment at 900°C for 10 h, the range of the specific surface area of LCO micropowders decreased from 1.00 to 3.20 m2/g, but particle size range slightly increased from 0.31 to 1.0 μm. The heat treatment of xerogels at a temperature 900°C for 30 h resulted in the particles size range growing from 0.50 to 1.25 μm, and the specific surface area was 2.00 m2/g for all LCO micropowders. There was no effect of PVP content in the ionic solution on the phase composition for all heat-treated LCO micropowders.
REFERENCES
Kushkhov, Kh.B., Vindizheva, M.K., and Mukozheva, R.A., RF Patent 2661481 C2, 2018. (Application 2015138734, 2015).
Zarrin, N., Husain, S., Gaur, D.D., et al., Dopant incited alterations in structural, morphological, optical, and dielectric properties of Er-doped LaCrO3, J. Mater. Sci.: Mater. Electron., 2020, vol. 31, no. 4, pp. 3466–3478.
Pal’guev, S.F., Gil’derman, V.K., and Zemtsov, V.I., Vysokotemperaturnye oksidnye elektronnye provodniki dlya elektrokhimicheskikh ustroistv (High-Temperature Oxide Electronic Conductors for Electrochemical Devices), Moscow: Nauka, 1990.
Fan, W., Zhou, J., Wu, K., et al., Characterization of Sr/Ru co-doped ferrite based perovskite as a symmetrical electrode material for solid oxide fuel cells, J. Power Sources, 2017, vol. 348, pp. 94–106.
Rath, M.K. and Lee, K.T., Investigation of aliovalent transition metal doped La0.7Ca0.3Cr0.8X0.2O3 – δ (X = Ti, Mn, Fe, Co, and Ni) as electrode materials for symmetric solid oxide fuel cells, Ceram. Int., 2015, vol. 41, no. 9, pp. 10878–10890.
Yaremchenko, A.A., Kharton, V.V., Viskup, A.P., Kovalevskii, A.V., Naumovich, E.N., and Vecher, A.A., Physical and chemical properties of magnesium-doped lanthanum cobaltite, Vestn. Beloruss. Gos. Univ. Ser. 2, Khim. Biol. Geograf., 2001, no. 1, pp. 20–24.
Kuznetsov, M.V. and Morozov, Yu.G., RF Patent 2010109904/05, 2011.
Yakovleva, I.S., Nadeev, A.N., Gerasimov, E.Yu., Ivanov, D.V., Dovlitova, L.S., Sutormina, E.F., Saputina, N.F., Litvak, G.S., and Isupova, L.A., Microwave synthesis of LaMO3 (M = Mn, Co, Fe) perovskites from crystalline hydrates of nitrates, Kinet. Catal., 2013, vol. 54, no. 1, pp. 119–129. https://doi.org/10.1134/S002315841301014X
Kovalevskii, A.V., Ilyushchenko, N.G., Varkin, V.N., and Sorokina, V.V., Diffusion saturation of nickel and cobalt with zirconium, lanthanum, and yttrium in halide melts, Izv. Vyssh. Uchebn. Zaved., Tsvetn. Metall., 1988, no. 5, pp. 20–22.
Nanoscale Science and Technology, Kelsall, R.W., Hamley, I.W., and Geoghegan, M., Eds., Chichester: Wiley, 2005.
Ermakova, E.A., Strel’nikova, S.S., Anokhin, A.S., et al., Sol-gel synthesis of lanthanum cobaltite powders with added strontium and calcium, Glass Ceram., 2021, vol. 77, nos. 11–12, pp. 438–441.
Mohamad, Y.A., Atassi, Y., and Moussa, Z., New synthesis parameters of GGG:Nd nanocrystalline powder prepared by sol–gel method: Structural and spectroscopic investigation, J. Lumin., 2015, vol. 165, pp. 1–5.
Voitovich, I.I., Vartanyan, M.A., Gorbunova, I.Yu., and Makarov, N.A., Peculiarities of phase formation in aqueous polymer-salt systems under the action of microwave radiation, Materialy mezhdunarodnoi nauchnoi konferentsii studentov, aspirantov i molodykh uchenykh “Lomonosov-2021,” Moskva, 12–23 aprelya 2021 (Proc. Int. Sci. Conf. of Students, Postgraduate Students, and Young Scientists “Lomonosov-2021,” Moscow, April 12–23, 2001), Moscow: Maks, 2021. ISBN 978-5-317-06593-5.
Kolesnikov, I.M., Kataliz i proizvodstvo katalizatorov (Catalysis and Production of Catalysts), Moscow: Tekhnika, 2004.
Gavrilova, L.Ya., Metody sinteza i issledovanie perspektivnykh materialov (Methods of Synthesis and Research of Promising Materials), Yekaterinburg: IONTs Nanotekhnol. Perspekt. Mater., 2008.
Anokhin, A.S., Strel’nikova, S.S., Andrianov, N.T., Makarov, N.A., Zhirov, D.A., and Solntsev, K.A., Sol-gel synthesis and properties of doped lanthanum chromite nanopowders, Inorg. Mater., 2013, vol. 49, pp. 935–938. https://doi.org/10.1134/S0020168513090021
Sidel’kovkaya, F.P., Khimiya N-vinilpirrolidona i ego polimerov (Chemistry of N-Vinylpyrrolidone and Its Polymers), Moscow: Nauka, 1970.
Shevchenko, O.A., Suris, A.L., and Shatalov, A.L., Investigation of the process of regeneration of silica gel by drying it in the super high-frequency electromagnetic field, Izv. MGTU MAMI, 2013, vol. 2, no. 3 (17), pp. 159–165.
Nakamoto, K., Infrared and Raman Spectra of Inorganic and Coordination Compounds, Hoboken, NJ: Wiley, 1991. https://doi.org/10.1002/9780470405840
Kim, Y.Y., Lee, D.H., Kwon, T.Y., and Park, S.H., Infrared spectra and seebeck coefficient of LnCoO3 with the perovskite structure, J. Solid State Chem., 1994, vol. 112, pp. 376–380. https://doi.org/10.1006/jssc.1994.1319
Kuznetsova, E.E., Selyunina, L.A., and Mishenina, L.N., The sol-gel synthesis of barium aluminate using microwave radiation, Vestn. Tomsk. Gos. Univ. K-him., 2016, no. 1 (3), pp. 19–28.
ACKNOWLEDGMENTS
We express our gratitude to the head of the laboratory Center for X-ray Diffraction Research and Diagnostics of Materials, National University of Science and Technology MISIS, Shchetinin Igor Viktorovich, Candidate of Engineering Sciences, for help in conducting this study.
Funding
This work was carried out within the framework of the State Task of the Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, no. 075-00715-22-00.
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Translated by Sh. Galyaltdinov
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Ermakova, E.A., Strelnikova, S.S., Anokhin, A.S. et al. Investigation of the Amount of Polyvinylpyrrolidone as Gelling Agent to Lanthanum Cobaltite Micropowders Synthesized by Sol-Gel Method. Inorg. Mater. Appl. Res. 14, 1422–1428 (2023). https://doi.org/10.1134/S2075113323050106
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DOI: https://doi.org/10.1134/S2075113323050106