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不大于500mg 的高纯度五氧化二钽可用40ml 热浓硫酸80克硫酸铵溶解。但费时,需热6小时,且溶解的量有限。五氧化二钽如用碱金属的硫酸氢盐或焦硫酸盐熔融,则熔融物难以用浓硫酸或酒石酸溶液溶解。我们曾试用多种熔剂熔融五氧化二钽,发现仅硝酸钾-碳酸钾组成的混合熔剂是有效的,熔融物在热浓硫酸中溶解可转化为澄清,但不溶于酒石酸溶液中。可将粉末状的 Ta_2O5(1g),KNO_5(2.5g)和K_2CO_3(2.5g)在15毫升铂坩埚内混匀,在740～760℃马弗炉里加热15分钟。如温度太高,则冷却后的熔融物不溶
Not more than 500mg of high purity tantalum oxide can be 40ml hot concentrated sulfuric acid dissolved in 80 grams of ammonium sulfate. But time-consuming, heat 6 hours, and the limited amount of dissolved. Tantalum pentoxide, if molten with alkali metal hydrogen sulfate or pyrosulfate, is difficult to dissolve in concentrated sulfuric acid or tartaric acid solution. We have tried a variety of flux melting tantalum pentoxide and found that only a mixed flux of potassium nitrate and potassium carbonate is effective. The melt dissolved in hot concentrated sulfuric acid can be converted to a clear, but insoluble in tartaric acid solution. Powders of Ta 2 O 5 (1 g), KNO 5 (2.5 g) and K 2 CO 3 (2.5 g) can be mixed in a 15 ml platinum crucible and heated in a muffle furnace at 740 to 760 ° C for 15 minutes. If the temperature is too high, the molten melt is insoluble