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

  • A. A. Guda
  • I. A. Pankin
  • A. L. Bugaev
  • K. A. Lomachenko
  • S. A. Guda
  • V. P. Dmitriev
  • A. V. Soldatov
Proceedings of the 20th National Conference on the Use of Synchrotron Radiation “SR-2014” and the National Youth Conference “Using Synchrotron Radiation”

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.

Keywords

Borohydride Hydrogen Desorption Diborane Metallic Manganese Irreversible Phase Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Allerton Press, Inc. 2015

Authors and Affiliations

  • A. A. Guda
    • 1
  • I. A. Pankin
    • 1
  • A. L. Bugaev
    • 1
  • K. A. Lomachenko
    • 1
  • S. A. Guda
    • 1
  • V. P. Dmitriev
    • 1
    • 2
  • A. V. Soldatov
    • 1
  1. 1.Southern Federal UniversityRostov-on-DonRussia
  2. 2.SNBL at ESRFPolygone Scientifique Louis NéelGrenobleFrance

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