In Situ Electron-Microscopic Study of the Growth of Iron Whiskers by Chemical Vapor Deposition
- 1 June 1969
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 40 (7) , 2696-2704
- https://doi.org/10.1063/1.1658064
Abstract
α‐Iron whiskers were grown under observation in situ in an electron microscope by the thermal decomposition of iron carbonyl in a stream of hydrogen at 710°–820°C. As many as three growth periods with distinct growth rates were observed. An initial slow growth was postulated to be due to growth at the base, caused by localized stresses in the three‐dimensional iron deposit on the screen on which the whiskers were growing. Subsequent growth at the tip appeared to be limited by both the impingement rate of iron carbonyl and the surface flux of iron on the shaft of the whisker. The diffusion coefficient, calculated to account for the observed maximum growth rate, is in good agreement with the value given in the literature. Subsequent slower growth was accounted for by the incorporation of the iron contained in the Fe (CO)5 which impinged on the tip alone. The morphological features observed and interpreted were tilting, bridge growth, lateral growth, curving, kinking, junction formation, and neck formation. It was shown that a whisker may grow by plastic deformation under tensile stress and simultaneous deposition on its shaft from a supersaturated gaseous atmosphere.This publication has 4 references indexed in Scilit:
- The growth and structure of gold and silver deposits formed by evaporation inside an electron microscopePhilosophical Magazine, 1964
- VAPOR-LIQUID-SOLID MECHANISM OF SINGLE CRYSTAL GROWTHApplied Physics Letters, 1964
- Comments on ``Growth of Crystal Whiskers'' by Blakely and JacksonThe Journal of Chemical Physics, 1963
- Study of the Initial Stages of Sintering Solids by Viscous Flow, Evaporation-Condensation, and Self-DiffusionJournal of Applied Physics, 1955