用俄歇電子譜儀和X射線光電子譜儀研究氧化物陰極
INVESTIGATION OF AN OXIDE CATHODE ON A Ni-W-Mg SUBSTRATE BY AES AND XPS
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摘要: 本文用俄歇電子譜儀和X射線光電子譜儀研究了氧化物陰極在分解激活過程中表面、基底和涂層交界面的化學成分、化學態(tài)以及基底中的激活劑對涂層的作用。獲得的實驗結果表明,在激活過程中,陰極表面諸成分的原子濃度百分比發(fā)生了明顯變化,產(chǎn)生了超額Ba。基底中的激活劑Mg對超額Ba的產(chǎn)生起重要作用。充分激活的陰極表面層是由(Ba,Sr,Ca)O和超額Ba構成的。超額Ba是電子發(fā)射的源泉。
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關鍵詞:
Abstract: Activation proeess of an oxide eathode on a Ni-W-Mg substrate was investigated using auger electron spectroscopy (ABS) and X-ray protoelectron spectroscopy (XPS).ABS and XPS results show that the relative surfaee compositions of alkaline earth metal of an oxide eathode have changed during various states of activation. The surfaee layer of a well activated eathode consists of (Ba, Sr, Ca) O+Ba. -
Б.П.Никонов, Известия АН СССР,сер.физ.35(1971), 270.[3]張恩虬,物理學報,23(1974), 341; 25(1976), 23.[4]G. A. Haas et al., Appl. of Surface Science, 2(1979), 293.[6]J. A. Th. Verhoeven, Appl. of Surface Science, 5(1980), 361.[7]Б.П.Никонов,Оксидный Катод, Издательство《Энершя》,1979, Москва. -
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