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将TiO_2、Nb_2O_5、WO_3混合在氢气中加热、然后转入氮气氛中在1200～1500℃加热,当温度再升至1500～2100℃时(氮气压力最好为30托,至少10
The mixture of TiO 2, Nb 2 O 5 and WO 3 is heated in hydrogen and then transferred to a nitrogen atmosphere and heated at 1200-1500 ° C. When the temperature rises to 1500-2100 ° C (the pressure of nitrogen is preferably 30 Torr, at least 10