Abstract
WE have recently measured the Hall coefficient R and the conductivity σ in oxide coatings sprayed on a magnesia base. By drawing D.C. and pulsed thermionic emission, we have been able to activate the coatings satisfactorily, obtaining a D.C. work function near 1,000° K. of 1·0–1·2 eV., a pulsed work function of 1·2–1·5 eV., and a saturated pulsed emission at 1,050° K. of 4–5 amp./cm.2. R and σ are calculated taking the observed mean thickness of the coating, with no correction for density, which is about unity.
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References
Vink, H. J., dissertation for doctor's degree in the University of Leyden (1948).
Jenkins, R. O., and Newton, R. H. S., Nature, 163, 572 (1949).
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WRIGHT, D. Hall Effect in Oxide Cathode Coatings. Nature 164, 714–715 (1949). https://doi.org/10.1038/164714b0
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DOI: https://doi.org/10.1038/164714b0
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