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Materials 2014, 7(5), 3901-3918; doi:10.3390/ma7053901

Synthesis of MgB2 at Low Temperature and Autogenous Pressure

1,* , 1
Received: 14 April 2014 / Revised: 4 May 2014 / Accepted: 9 May 2014 / Published: 15 May 2014
(This article belongs to the Section Materials for Energy Applications)
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High quality, micron-sized interpenetrating grains of MgB2, with high density, are produced at low temperatures (~420 °C < T < ~500 °C) under autogenous pressure by pre-mixing Mg powder and NaBH4 and heating in an Inconel 601 alloy reactor for 5–15 h. Optimum production of MgB2, with yields greater than 75%, occurs for autogenous pressure in the range 1.0 MPa to 2.0 MPa, with the reactor at ~500 °C. Autogenous pressure is induced by the decomposition of NaBH4 in the presence of Mg and/or other Mg-based compounds. The morphology, transition temperature and magnetic properties of MgB2 are dependent on the heating regime. Significant improvement in physical properties accrues when the reactor temperature is held at 250 °C for >20 min prior to a hold at 500 °C.
Keywords: magnesium diboride synthesis; sodium borohydride; superconductivity magnesium diboride synthesis; sodium borohydride; superconductivity
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Mackinnon, I.D.R.; Winnett, A.; Alarco, J.A.; Talbot, P.C. Synthesis of MgB2 at Low Temperature and Autogenous Pressure. Materials 2014, 7, 3901-3918.

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