A 300 g batch of each powder mixture was placed in a high-energy ball mill (Zoz , Wenden, Germany, Simoloyer CM08) and milled under argon atmosphere for 6 h. Hardened steel balls (52100 heat-treated steel with a hardness of 60–64 Rockwell C) and jar were used and a ball to powder weight ratio of 10:1 was chosen for milling.
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