Abstract
Anti-bombing insensitivity of La 2O 3–Y 2O 3–Mo secondary emitter has been studied in this paper. The variation of maximum secondary emission coefficient δ max with time was measured. The cathode after life experiment was analyzed by means of HRM, SEM, EDS and XRD. The results showed that δ max of La 2O 3–Y 2O 3–Mo cathode operating at 1100 °C under continuous electron bombardment of 300 W/cm 2 was still about 2.5 after 1000 h operation, indicating that this kind of cathode had good anti-bombing insensitivity. In the internal part of the cathode, RE 2O 3 (rare earth oxide) and molybdenum grains distributed alternately and there existed a certain relationship between crystallographic orientation of RE 2O 3 and that of molybdenum. It was found that a RE 2O 3 layer was formed on the surface after operation. The high δ max of La 2O 3–Y 2O 3–Mo cathode was related to the RE 2O 3 layer on the surface and the amount of nanosized La 2O 3 particles on the Y 2O 3 layer.
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