“…%B) [ 27 , 29 , 38 , 39 , 40 , 41 ], the boron concentration at the FeB/Fe 2 B growth interface is (=16.2 wt. %B) [ 27 , 29 , 37 , 38 , 39 , 40 , 41 ], the concentration at the diiron boride/ferrous or non-ferrous alloy interface is (=8.8 wt. %B) [ 27 , 29 , 34 , 38 , 39 , 40 , 41 ], and (=3.5 × 10 –5 wt.…”