Letter | Published:

Thermionic Properties of Thoria

Nature volume 160, pages 129130 (26 July 1947) | Download Citation



It may be of interest to record our recent results on the thermionic properties of thoria coatings and of thoria in bulk. In the first experiments, a coating of thoria about 0.1 mm. thick was formed on a tantalum strip by spraying. The spraying suspension was made using an organic binder and solvent, as employed in standard techniques with barium–strontium carbonates. Direct current and pulsed emission were studied in a simple diode the anode of which could be water-cooled. The thoria surface temperature was estimated from pyrometer measurements assuming a spectral emissivity of 0.35 over the temperature range 1,800°–2,100° K.

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    , Rev. Gen. Elec., 54, 243 (1945).

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  1. Research Laboratories of the General Electric Co., Ltd., Wembley.

    • D. A. WRIGHT


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