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Reaction of Niobium Pentachloride with Sodium Borohydride in Ionic Melts

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Inorganic Materials Aims and scope

Abstract—

We have studied reaction between mechanochemically preactivated NbCl5 and NaBH4 powders in the molar ratio 1 : 2.4 at temperatures from 873 to 1073 K and reaction times from 8 to 15 h under an argon pressure of 4 MPa in ionic melts (Na2B4O7, КСl, KBr,, and 50 mol % NaCl + 50 mol % KCl or 58 mol % LiCl + 42 mol % KCl eutectic mixture). The results demonstrate that the use of the ionic melts makes it possible to obtain almost spherical niobium diboride nanoparticles with an average size from ~12 to 17 nm (depending on reaction temperature), hexagonal structure (sp. gr. P6/mmm), and unit-cell parameters a = 0.3105–0.3125 nm and c = 0.3269–0.3294 nm.

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ACKNOWLEDGMENTS

In this study, we used equipment at the Shared Analytical Facilities Center, Institute of Problems of Chemical Physics, Russian Academy of Sciences, and at the Shared Research Facilities Center, Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences.

Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education, state research targets for the Institute of Problems of Chemical Physics, Russian Academy of Sciences (state registration no. AAAA-A19-119061890019-5) and the Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences (theme no. FFSZ-2022-0009).

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. A. Vinokurov, N. N. Dremova & S. P. Shilkin

  2. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    D. Yu. Kovalev & G. R. Nigmatullina

Authors
  1. A. A. Vinokurov
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  2. D. Yu. Kovalev
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  3. G. R. Nigmatullina
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  4. N. N. Dremova
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  5. S. P. Shilkin
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Correspondence to S. P. Shilkin.

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Translated by O. Tsarev

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Vinokurov, A.A., Kovalev, D.Y., Nigmatullina, G.R. et al. Reaction of Niobium Pentachloride with Sodium Borohydride in Ionic Melts. Inorg Mater 58, 838–844 (2022). https://doi.org/10.1134/S0020168522080143

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