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Interaction between Barium Oxide and Carbon Film in BaO/C/Mo System under High Temperature
Yue Hui Lu,Xue Mei Wu,Lan Jian Zhuge,Xiang Huai Liu 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Carbon ¯lm, used as the coating of the Mo grid in pulsed-controlled grid traveling wave tubes, can eectively suppress electron emission from the Mo grid contaminated by the emission material of the hot cathode, i.e. BaO or Ba, so that the lifetime of the tubes can be prolonged signi¯cantly but the reasons for it have not been well understood. To study the eect of it on the BaO/Mo system under high temperature, carbon ¯lms were prepared on Mo substrate at room temperature by a dual-ion-beam sputtering deposition system, and post-annealing was conducted to know their microstructure under high temperature. In our experiments, BaO layers were coated on Mo and carbon-coated Mo substrates by the chemical method to compare with each other, and the prepared BaO/Mo and BaO/C/Mo samples were annealed at two dierent temperatures of 973 K and 1223 K in order to investigate the interaction between barium oxide and carbon ¯lm under high temperature. The results show that the BaO/C/Mo changes into C/Mo after the exhaustion of BaO at 1223 K, nevertheless, This does not happen at 973 K. In this paper, the mechanism whereby the addition of carbon ¯lm can suppress the grid emission under its operating condi-tion is discussed according to the experimental results and the calculation of the reaction free energy.
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