논문 상세보기
pp.241-251
There are several manufacturing techniques for developing thermionic cathodes for vacuum ultraviolet(VUV) ionizers. The triple alkaline earth metal emitters(Ca-Sr-Ba) are formulated as efficient and reliable thermo-electron sources with a great many different compositions for the ionizing devices. We prepare two basic suspensions with different compositions: calcium, strontium and barium. After evaluating the electron-emitting performance for europium, gadolinium, and yttrium-based cathodes mixed with these suspensions, we selected the yttrium for its better performance. Next, another transition metal indium and a lanthanide metal neodymium salt is introduced to two base emitters. These final composite metal emitters are coated on the tungsten filament and then activated to the oxide cathodes by an intentionally programmed calcination process under an ultra-high vacuum(~10-6 torr). The performance of electron emission of the cathodes is characterized by their anode currents with respect to the addition of each element, In and Nd, and their concentration of cathodes. Compared to both the base cathodes, the electron emission performance of the cathodes containing indium and neodymium decreases. The anode current of the Nd cathode is more markedly degraded than that with In.
1. 서 론
2. 실험 방법
2.1 시약 및 기기
2.2 BE-01 및 BE-02 현탁액 및 시험군 현탁액의제조
2.3 인듐과 네오디뮴이 첨가된 현탁액 제조
2.4 필라멘트의 코팅 및 소결
2.5 금속산화물 캐소드의 열전자 방출량의 측정
3. 결과 및 고찰
3.1 BE-01및 BE-02 기반 복합 금속 산화물 캐소드의 열중량 분석
3.2 복합 금속 산화물 캐소드의 성능 및 특성 분석
4. 결 론
References
