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A New Method for Synthesis of Binary Borides with Desired Properties

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Abstract

Complexes [Co(solv)n][B10H10], where (I: solv = H2O, n = 6; II: solv = N2H4, n = 3) have been synthesized and characterized. The possibility to use them as precursors in the synthesis of binary borides has been demonstrated. The purity and homogeneity of the precursors and the products of their thermal reduction (in an inert atmosphere at 650 and 900°С) has been established by elemental analysis, X-ray powder diffraction, and IR spectroscopy; magnetochemical studies of the precursors and their annealing products have been carried out. According to the data obtained, the reduction products are structured oxide-boride and nitride-boride phases, respectively. Magnetochemical study of the phases has revealed a significant difference in their magnetic behavior: the oxide-boride phase is characterized by a significant ferromagnetic contribution to the total magnetization of the sample, while the nitride-boride phase, by a diamagnetic contribution.

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Notes

  1. Elemental analysis for carbon, hydrogen, and nitrogen was preformed on a Carbo Erda CHNS-3 FA 1108 Elemental Analyzer. Boron and cobalt were quantified by the ICP MS method on an iCAP 6300 Duo inductively coupled plasma atomic emission spectrometer.

  2. IR spectra of the initial compounds and thermolysis products were recorded on a Lumex Infralum FT-02 spectrophotometer as Nujol mulls (Aldrich), NaCl plates, 4000–400 cm–1, resolution 1 cm–1.

  3. X-ray powder diffraction analysis was carried out on a Bruker D8 Advance diffractometer (CuKα radiation) in low-background cells with an oriented silicon substrate in the 2θ range 5°–80° with a step of 0.01125°.

  4. Magnetic susceptibility was studied in the temperature range 300–2 K on a Quantum Design PPMS 9 automated physical property measurement system with an option for measuring AC and DC magnetization.

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Funding

The work was supported through a grant from the Russian Science Foundation (project no. 14–13–01115.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    E. A. Malinina, L. V. Goeva, G. A. Buzanov, V. V. Avdeeva, N. N. Efimov &  N. T. Kuznetsov

Authors
  1. E. A. Malinina
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  2. L. V. Goeva
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  3. G. A. Buzanov
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  4. V. V. Avdeeva
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  5. N. N. Efimov
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  6. N. T. Kuznetsov
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Corresponding authors

Correspondence to E. A. Malinina or V. V. Avdeeva.

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Translated by G. Kirakosyan

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Malinina, E.A., Goeva, L.V., Buzanov, G.A. et al. A New Method for Synthesis of Binary Borides with Desired Properties. Dokl Chem 487, 180–183 (2019). https://doi.org/10.1134/S0012500819070061

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  • DOI: https://doi.org/10.1134/S0012500819070061

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