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Synthesis of a Sodium-Ion-Emitting Material and Analysis of Its Na$^+$ Emission Characteristics
New Physics: Sae Mulli 2017; 67: 1072~1079
Published online September 29, 2017;
© 2017 New Physics: Sae Mulli.

Dae Sun CHOI*

Department of Physics, Kangwon National University, Chunchon 24341, Korea 
Correspondence to:
Received July 7, 2017; Revised July 25, 2017; Accepted July 25, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this study, I synthesized a $\beta$-eucryptite-like Na$^+$-emitting material for various purposes and analyzed quantitatively its emission characteristics. The results of a residual gas analysis showed that the purity of the emitted Na$^+$ ion was high and that the material had a very small amount of outgassing in an ultra-high vacuum, even at high temperatures. The maximum ion-beam current density was measured to be 18.2 A/m$^2$ when the filament potential was 1500 V and the filament temperature was 1270 K. The estimated ion-emitting energy was 3.36 eV, meaning that the Na$^+$ ion could be easily emitted. The measured half-life times for filament temperatures of 1270 K and 1190 K were 334.7 min and 2067.6 min, respectively, meaning that this material has a very long lifetime. I derived the ion-beam current density as a function of the filament temperature, filament potential, and working time. I conclude that these results can be applied to various industrial and research fields.  
PACS numbers: 81.05.Zx
Keywords: Na$^+$, Ion, Synthesis, $\beta$-eucryptite-like material, Current density, Half-life times

September 2017, 67 (9)