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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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