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- Title
High-Temperature Field Evaporation of Rhenium.
- Authors
Golubev, O. L.; Shrednik, V. N.
- Abstract
High-temperature field emission of Re, Pt, Ta, and W is studied by field-emission methods. Metal ions are found to evaporate mainly from the tops of thermal-field microprotrusions produced by high electric fields and temperatures on the emitter surface. For field intensities of up to F = 1-2 V/Å and temperatures of 1500-2000 K, the ion currents i are recorded from the entire emitter surface. They range from several tenths of nanoamperes to several nanoamperes. The activation energies of field evaporation determined from the Arrhenius plots log/ =f(l/T) are found to be appreciably lower than those calculated within the charge exchange model for known parameters of the process and the metals evaporated. Reasons for such a difference in the activation energies and mechanisms of ion evaporation at high F and Tare discussed.
- Subjects
FIELD emission; RHENIUM; HIGH temperatures; METAL ions
- Publication
Technical Physics, 2002, Vol 47, Issue 8, p1038
- ISSN
1063-7842
- Publication type
Article
- DOI
10.1134/1.1501687