Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe2Al1.15−xB2GexGax (x = 0, 0.05) MAB phases

Reactive single-step hot-pressing at 1473 K and 35 MPa for 4 h produces dense, bulk, near single-phase, low-cost, low-criticality Fe2Al1.15B2 Fe2Al1.1B2Ge0.05Ga0.05 MAB samples, showing second-order magnetic phase transition with favorable magnetocaloric properties around room temperature. The as well the can be tailored upon Ge Ga doping, leading to an increase in Curie temperature TC spontaneous magnetization mS. maximum isothermal entropy change ΔsT,max of hot-pressed field changes 2 5 T amounts 2.5 J(kgK)−1 287.5 increases by addition 3.1 6.2 306.5 K, respectively. directly measured adiabatic ΔTad,max is improved composition modification from 0.9 1.1 1.93 T. Overall, we demonstrate that provides a much faster, more scalable, processing costs reducing alternative compared conventional synthesis routes produce heat exchangers cooling devices. Therefore, our criticality assessment shows Fe-based phases provide promising compromise material costs, criticality, performance, demonstrating potential low-cost applications