The influence of the milling time on the yield of Mg_2FeH_6 from a two-step synthesis conducted in a custom-made reactor

摘要

Dimagnesium iron hydride was synthesized by mechanical milling of a MgH_2/Fe mixture followed by sintering under a high hydrogen pressure (120 bar). The influence of the milling time on the synthesis yield was observed. Properly chosen processing parameters led to a 94-97 % reaction yield (depending on the measurement method) for the formation of Mg_2FeH_6. Milling times that were too short or too long proved to be ineffective. A custom-made reactor for synthesis of a batch of up to 20 g is presented. Synthesized samples were characterized by XRD analysis and PCT measurements were performed.