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(一)缓冲体系的选择载体分馏法在测定稀土氧化物中非稀土杂质的应用是十分成功的,它的检测能力要比一般的电弧粉末法高一个数量级左右,若分馏选择在控制气氛中进行,其效果更好。稀土氧化物的沸点在3000—4000℃之间,其挥发次序排列在氧化物挥发顺序表的末尾,属难挥发元素。稀土金属的挥发性与相应的氧化物大体相近,但略易挥发。然而,钐、铕、镱三元素例外,它们的沸点分别只有1900 ℃、1600℃和
(A) the choice of buffer system Carrier fractionation method in the determination of non-rare earth oxide rare earth impurities in the application is very successful, its detection capability than the average arc powder method an order of magnitude higher, if the fractionation option in a controlled atmosphere , Its effect is better. Rare earth oxides boiling point between 3000-4000 ℃, the volatile order of the order of the oxide evaporation table at the end, is a volatile element. The volatility of rare earth metals and oxides are generally similar, but slightly volatile. However, with the exception of samarium, europium and ytterbium tri-elements, their boiling points are only 1900 ° C, 1600 ° C and