Molten salt shielded synthesis of the nanolaminated transition metal boride Fe2AlB2

Abstract

Fe 2 AlB 2 is one of many ternary transition metal borides called MAB phases, which attracted interest owing to its magnetocaloric effect and magnetic properties. Herein, the molten salt shielded synthesis (MS 3 ) of Fe 2 AlB 2 powder is studied using potassium bromide "KBr" in an open-air atmosphere. The synthesis process of the MAB phase, from Fe, Al, and B elemental powders, was studied with and without Sn additive in the temperature range of 900-1200°C. The obtained powders were analyzed using XRD, TDA, GTA and SEM analysis. The corresponding results revealed a successful synthesis of nearly-pure Fe 2 AlB 2 phase at 1000°C for only one hour of holding time, beyond which FeB impurities form. These results show the e ciency of KBr (with Sn as a synthesis aid 'additive') in increasing the reactivity of this MAB phase in terms of the lowest synthesis temperature and time reported to date.