Effects of Metal Defects on Positive Ion Emission from Heated Iron Filaments

Autor:	R. F. Tinder, E. E. Donaldson, G. A. Antypas
Rok vydání:	1964
Předmět:	Metal Materials science Impurity Diffusion visual_art visual_art.visual_art_medium General Physics and Astronomy Electron Deformation (engineering) Flashing Thermal diffusivity Molecular physics Ion
Zdroj:	Journal of Applied Physics. 35:3452-3455
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1713248
Popis:	The positive ion current emitted by heated filaments of high‐purity Fe displayed sharp maxima when the metal passed through the structural transformation temperature. The height of the maxima varied with previous flashing temperatures and with the direction of approach to the transformation. Plastic deformation also produced maxima in the positive ion current after a temperature‐dependent time delay; the peak height was approximately proportional to strain. Electron emission from the same filaments was unaffected by these factors. The results suggest that the positive ion emission from flash‐cleaned Fe filaments is not surface controlled and they seem to require internal rate controlling mechanisms which involve diffusion of the impurity species to the surface along high diffusivity paths.
Databáze:	OpenAIRE
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