Mechanochemically assisted preparation of NbB2 powder

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Abstract A powder mixture of Nb-B (1:2) was milled using milling media of different sizes in a planetary ball mill, and NbB 2 was mechanochemically prepared. When the mixture was milled with 5 mm diameter balls, NbB 2 started to form in 20 h and the single phase NbB 2 was obtained in 50 h. The time required for the NbB 2 formation and the single phase decreased with the increase in the ball size. The lattice parameters of the NbB 2 obtained were a  = 0.3112 nm, c  = 0.3276 nm. The average particle size of the NbB 2 powder obtained by milling with the 5 and 9 mm diameter balls for 50 h was approximately 370 nm.

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