Surface Ionization and Thermoelectronic Property of Uranium Dioxide

NORIAKI SASAKI; KENJI KUBO; MITSURU ASANO; SABURO MAGARI

doi:10.5702/massspec1953.17.745

NORIAKI SASAKI, KENJI KUBO, MITSURU ASANO, SABURO MAGARI

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JOURNAL FREE ACCESS

1969 Volume 17 Issue 3 Pages 745-753

DOI https://doi.org/10.5702/massspec1953.17.745

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Published: September 01, 1969 Received: July 17, 1969 Available on J-STAGE: June 28, 2010 Accepted: - Advance online publication: - Revised: -
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Abstract

The ionic species emitted from uranium dioxide on the tungsten and rhenium filaments by the surface ionization have been identified as UO2⁺, UO⁺ and U⁺. The ion of UO3⁺ could not be observed in any conditions. By measuring the ionic currents of ²³⁸U¹⁶O2⁺ and ²³⁸U¹⁶O⁺ the values of the heats of vaporization of UO2⁺ and UO⁺ have been estimated. The value of UO2⁺ changes at about 2230 °K for the tungsten filament and 2080 °K for the rhenium, respectively, and the values for the higher temperature range are larger than those for the lower range, irrespective of the filament materials. The thermoelectronic properties of uranium dioxide have been studied. The work function of the filament covered with the uranium dioxide changes at the specific temperature similarly to the ionic emission of UO2⁺. From the experimental data of the ionic emissions of UO2 and UO, and those of the thermoelectronic emissions, the heats of vaporization of uranium dioxide and monoxide molecules from uranium dioxide on the tungsten and rhenium filaments have also been calculated.

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