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X-ray absorption spectroscopy determination of the products of manganese borohydride decomposition upon heating

Bulletin of the Russian Academy of Sciences: Physics volume 79, pages 139–143 (2015)Cite this article

Abstract

Manganese borohydride Mn(BH4)2 powder is heated in a hydrogen atmosphere in vacuum. The long-range order in the structure is monitored in situ by means of X-ray absorption spectroscopy and X-ray diffraction; short-range order, via Mg K-edge X-ray absorption near-edge structure spectroscopy. Above 120°C, the X-ray diffraction pattern disappears and an irreversible phase transition occurs, accompanied by sample amorphization and profuse hydrogen desorption. In the hydrogen atmosphere, the phase transition occurs at a temperature of ∼110°C. The standard scheme of borohydride decomposition suggests hydrogen desorption and the formation of metallic manganese and boron. However, a theoretical analysis of X-ray absorption spectra shows that the most likely products of Mn(BH4)2 decomposition are manganese borides.

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Authors and Affiliations

  1. Southern Federal University, Rostov-on-Don, 344090, Russia

    A. A. Guda, I. A. Pankin, A. L. Bugaev, K. A. Lomachenko, S. A. Guda, V. P. Dmitriev & A. V. Soldatov

  2. SNBL at ESRF, Polygone Scientifique Louis Néel, 38000, Grenoble, France

    V. P. Dmitriev

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  1. A. A. Guda
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  2. I. A. Pankin
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  3. A. L. Bugaev
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  4. K. A. Lomachenko
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  5. S. A. Guda
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  6. V. P. Dmitriev
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  7. A. V. Soldatov
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Correspondence to A. A. Guda.

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Original Russian Text © A.A. Guda, I.A. Pankin, A.L. Bugaev, K.A. Lomachenko, S.A. Guda, V.P. Dmitriev, A.V. Soldatov, 2015, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2015, Vol. 79, No. 1, pp. 154–159.

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Guda, A.A., Pankin, I.A., Bugaev, A.L. et al. X-ray absorption spectroscopy determination of the products of manganese borohydride decomposition upon heating. Bull. Russ. Acad. Sci. Phys. 79, 139–143 (2015). https://doi.org/10.3103/S1062873815010153

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  • DOI: https://doi.org/10.3103/S1062873815010153

Keywords

  • Borohydride
  • Hydrogen Desorption
  • Diborane
  • Metallic Manganese
  • Irreversible Phase Transition