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我们在自己研制的透射电镜及扫描电镜上都使用了一种高亮度,长寿命的Y_2o_3—I_r电子源,在25KV时得到的理论亮度值B≥4×10~5A/cm~2sr,使用寿命超过200小时,这种阴极发射稳定,抗中毒性能好,能在较差的真空条件下工作;结构简单,使用方便,特别可贵的是它与通常的钨发叉标准灯丝完全可以互换,勿需在电镜上作任何更改。可以说它兼有钨发叉阴极及LaB_6阴极的主要优点。
We have developed in their own transmission electron microscopy and scanning electron microscopy have used a high brightness, long life Y_2o_3-I_r electron source at 25KV theoretical brightness value B ≥ 4 × 10 ~ 5A / cm ~ 2sr, life More than 200 hours, this cathode emission stable, anti-toxic performance, can work under poor vacuum conditions; simple structure, easy to use, particularly valuable is that it is generally interchangeable with the standard tungsten filament Forklift, do not Need to make any changes in the electron microscope. It can be said that it combines the main advantages of tungsten hair cathode and LaB_6 cathode.