High Temperature Chemical Reaction of La2O3 in H3BO3 -C System

The high temperature chemical reaction process of La2 O3 in H3BO3-C system was studied by means of XRD and TG-DTA. The results showed that dehydration reaction of H3BO3 occurred in the temperature range of 82 ∼ 390 °C; La2O3 and B2O3 reacted to form LaB3O6, LaBO3, and B4C in the temperature range of 836 ∼ 1400°C; at 1450 °C, B4C and LaBO3 further reacted to form LaB4, and partial LaB4 and B reacted to form LaB6; at 1500 °C, LaB4 and B reacting into LaB6 was the main reaction, and the content of LaB6 increased with prolonging time.