单质的制备 1.硼制备： 钽、钨或氮化硼表面 (1)必菱形硼12BL B12(C)+182(g) 800~1100℃ (2)无定形硼 Na2B40,10H20+2HC1=4H3B03+2NaCI+5H20 2HB03=B203+3H20(800K) B203+Mg=3MgO+2B(800K) 单质的制备 1. 硼制备： 钽、钨或氮化硼表面 (1) -菱形硼 12 BI3 ══════ B12(C) + 18 I2 (g) 800~1100 ℃ (2)无定形硼 Na2B4O7·10H2O + 2HCl = 4H3BO3 + 2NaCl + 5H2O 2H3BO3 = B2O3 +3 H2O (800 K) B2O3 + Mg = 3MgO + 2B (800 K)