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Formation of the Pore Structure of Tantalum and Niobium Powders during Magnesiothermic Reduction of Lithium Tantalate and Lithium Niobate

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Abstract

We have studied characteristic features of the reduction of single-crystal lithium tantalate and lithium niobate powders with magnesium vapor in the temperature range 1023–1123 K. The results demonstrate that the reduction of single-crystal particles is accompanied by their spontaneous mechanical disintegration. The presence of Li2O in the double oxides has not led to an increase in the specific surface area of the metallic powders obtained. Li2O has been completely reduced in the final stage of the process, without contributing to an increase in the number of pores in the structure of the powder particles.

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REFERENCES

  1. Shekhter, L.N., Tripp, T.B., Lanin, L.L., et al., US Patent 6171363, 2001.

  2. Fischer, V., Stormer, H., Gerthsen, D., et al., Niobium as new material for electrolyte capacitors with nanoscale dielectric oxide layers, Proc. 7th Conf. on Properties and Applications of Dielectric Materials, Nagoya, 2003, vol. 3, pp. 1134–1137. https://doi.org/10.1109/ICPADM.2003.1218623

  3. Luidold, S. and Ressel, R., Tantalum and niobium powders for electrolytic capacitors, Proc. Eur. Metallurgical Conf. EMC 2009, Innsbruck, 2009. https://www.researchgate.net/publication/282178350

  4. Shekhter, L.N., Tripp, T.B., Lanin, L.L., et al., US Patent 6558447, 2001.

  5. Haas, H., Magnesium vapour reduced tantalum powders with very high capacitances, CARTS Europe2004: 18th Annual Passive Components Conf., 2004, pp. 5–8.

  6. Müller, R., Bobeth, M., Brumm, H., et al., Kinetics of nanoscale structure development during Mg-vapour reduction of tantalum oxide, Int. J. Mater. Res., 2007, vol. 98, no. 11, pp. 1138–1145.

    Article  Google Scholar 

  7. Gille, G., Schnitter, Ch., Brumm, H., et al., WO Patent 2009/021820, 2009.

  8. Orlov, V.M., Kryzhanov, M.V., and Kalinnikov, V.T., Magnesium reduction of tantalum oxide compounds, Dokl. Chem., 2014, vol. 457, no. 2, pp. 160–163.

    Article  CAS  Google Scholar 

  9. Orlov, V.M., Kryzhanov, M.V., and Kalinnikov, V.T., Magnesium-vapor reduction of niobium oxide compounds, Dokl. Chem., 2015, vol. 465, no. 1, pp. 257–260.

    Article  CAS  Google Scholar 

  10. Kolosov, V.N., Miroshnichenko, M.N., and Orlov, V.M., Influence of the composition of precursors and reduction conditions on the properties of magnesiothermic molybdenum powders, Inorg. Mater., 2017, vol. 53, no. 10, pp. 1058–1063.

    Article  CAS  Google Scholar 

  11. Kolosov, V.N., Miroshnichenko, M.N., and Orlov, V.M., Influence of the chemical composition of precursors and reduction conditions on the properties of magnesiothermic tungsten powders, Inorg. Mater., 2016, vol. 52, no. 8, pp. 783–790.

    Article  CAS  Google Scholar 

  12. Orlov, V.M., Kryzhanov, M.V., and Knyazeva, A.I., Tantalum powders with a mesoporous structure, Prot. Met. Phys. Chem. Surf., 2016, vol. 52, no. 5, pp. 814–818.

    Article  CAS  Google Scholar 

  13. Orlov, V.M., Kryzhanov, M.V., Knyazeva, A.I., and Osaulenko, R.N., Niobium powders of mesoporous structure, Prot. Met. Phys. Chem. Surf., 2018, vol. 54, no. 5, pp. 782–787.

    Article  CAS  Google Scholar 

  14. Orlov, V.M. and Kryzhanov, M.V., Production of tantalum nanopowders by magnesium reduction of tantalates, Russ. Metall. (Engl. Transl.), 2015, no. 4, pp. 590–596.

  15. Orlov, V.M. and Kryzhanov, M.V., Thermodynamic modeling of the magnesiothermic reduction of magnesium and lithium tantalates, Inorg. Mater., 2015, vol. 51, no. 6, pp. 618–622.

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Minerals (separate subdivision), Kola Scientific Center Federal Research Center, Russian Academy of Sciences, 184209, Apatity, Murmansk oblast, Russia

    V. M. Orlov, M. V. Kryzhanov & E. N. Kiselev

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  1. V. M. Orlov
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  2. M. V. Kryzhanov
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  3. E. N. Kiselev
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Correspondence to V. M. Orlov.

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Orlov, V.M., Kryzhanov, M.V. & Kiselev, E.N. Formation of the Pore Structure of Tantalum and Niobium Powders during Magnesiothermic Reduction of Lithium Tantalate and Lithium Niobate. Inorg Mater 56, 934–940 (2020). https://doi.org/10.1134/S0020168520080117

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  • DOI: https://doi.org/10.1134/S0020168520080117

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