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各种铝酸盐钡钨阴极的发射物质中存在着2BaO·CaO·Al_2O_3和可利用氧化钡的共同成分。氧化钙的作用在于参予组成了2BaO·CaO·Al_2O_3相成分,稳定了可利用氧化钡。在掺氧化钪的发射物质5BaO·3CaO·2Al_2O_3·0.6Sc_2O_3中,氧化钪的作用则在于它和铝酸盐中的可利用氧化钡结合为2BaO·Sc_2O_3,成为电子发射源氧化钡或钡原子的载体,它起控制和补充发射源的作用。这个机理得到实验证实。
Various aluminate barium tungsten cathode emitters exist 2BaO · CaO · Al_2O_3 and barium oxide can be used common components. The role of calcium oxide is to participate in the formation of 2BaO · CaO · Al_2O_3 phase composition, stabilizing the available barium oxide. In the scandium oxide-doped emissive material 5BaO.3CaO.2Al2O3-6.6Sc203, the scandium oxide has the effect that it combines with the available barium oxide in the aluminate to be 2BaO.Sc_2O_3 to become the electron-emitting source of barium oxide or barium atom Carrier, which plays the role of controlling and supplementing the emitter. This mechanism has been experimentally confirmed.