Magnetic, Microwave Absorbing Performance of Al8Mn5 Alloy with La Dopant.

The Al₈Mn_{5 − x}La_x (x = 0, 0.2, 0.6, 1.0) powders were triumphantly manufactured by vacuum melting and planetary mill equipment. The influences of La content on phase constitution, morphology, saturation magnetization, and electromagnetic parameters were investigated by related equipment. The consequences demonstrate that Al₈Mn₄La phase, average size of particulate increases and the saturation magnetization (Ms) decreases as La content increased. The minimum reflectivity of Al₈Mn_4.4La_0.6 powder reaches about −43.5 dB in the range of 10.8 to 11.7 GHz, and the effective bandwidth (RL < − 10 dB) can obtain about 1.70 GHz with the best matching thickness of 1.8 mm. These manifest Al₈Mn_5-xLa_x (x = 0, 0.2, 0.6, 1.0) powders possess the capacity to be excellent microwave absorbing materials. [ABSTRACT FROM AUTHOR]