Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure.

Author(s) Shahbazi, M.; Cathey, H.E.; Mackinnon, I.D.R.
Journal Materials (Basel)
Date Published 2018 Mar 23
Abstract

We demonstrate synthesis of the ternary intermetallic MgNi₃B₂ using autogenous pressure from the reaction of NaBH₄ with Mg and Ni metal powder. The decomposition of NaBH₄ to H₂ and B₂H₆ commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi₃B₂ with the increase in temperature. MgNi₃B₂ aggregates with Ni-boride cores are formed when the reaction temperature is >670 °C and autogenous pressure is >1.7 MPa. Morphologies and microstructures suggest that solid-gas and liquid-gas reactions are dominant mechanisms and that Ni-borides form at a lower temperature than MgNi₃B₂. Magnetic measurements of the core-shell MgNi₃B₂ aggregates are consistent with ferromagnetic behaviour in contrast to stoichiometric MgNi₃B₂ which is diamagnetic at room temperature.

DOI 10.3390/ma11040480
ISSN 1996-1944
Citation Shahbazi M, Cathey HE, Mackinnon ID. Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure. Materials (Basel). 2018;11(4).

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