Structural and electrochemical properties of amorphous rich Mg_xNi_(100-x) nanomaterial obtained by mechanical alloying

摘要

Using a planetary ball mill and starting from a mixture of Mg_2Ni and Ni with a Mg atomic content ranging from 40 to 60 at. percent, we have elaborated amorphous phase alloys with little quantities of residual Ni. The synthesis of the amorphous phase proceeded at 6.49 W g~(-1) shock power, for milling durations ranging from 8 to 10 h for Mg_(40)Ni_(60) and Mg_(60)Ni_(40) samples, respectively. The best electrochemical capacity (470 mAh g~(-1), equivalent of MgNiH_(2.0)) was obtained for the Mg_(50)Ni_(50) sample synthesized in milling duration 10 times shorter than that commonly reported in the literature.