Kinetics of Growth of Al2O3 Whiskers

The kinetics of the growth of Al2O3 whiskers by the reaction of Al with a trace amount of H2O in an H2 atmosphere were studied. The activation energy in the region of constant growth rate was ∼77 kcal mol−1. This activation energy value, in the light of thermodynamic calculations and other theoretical considerations, suggests that the rate-determining step in the growth of these whiskers is the dissociation of H2O molecules on the surface of Al2O3.

[1]  S. Minagawa,et al.  X‐Ray Microtopographs of Alpha Alumina Whiskers , 1969 .

[2]  Tadashi Saito,et al.  Growth Patterns on the Surface of Alumina Grown by Chemical Vapor Deposition , 1968 .

[3]  R. Schwoebel.  A Diffusion Model for Filamentary Crystal Growth , 1967 .

[4]  P. L. Edwards,et al.  Comparison of Whisker Growth Sites and Dislocation Etch Pits on Single-Crystal Sapphire , 1966 .

[5]  D. R. Cruise.  Notes on the Rapid Computation of Chemical Equilibria , 1964 .

[6]  J. Hirth,et al.  Kinetics of Diffusion-Controlled Whisker Growth , 1964 .

[7]  D. J. Barber.  Electron microscopy and diffraction of aluminium oxide whiskers , 1964 .

[8]  R. S. Wagner,et al.  VAPOR‐LIQUID‐SOLID MECHANISM OF SINGLE CRYSTAL GROWTH , 1964 .

[9]  P. L. Edwards,et al.  Alumina Whisker Growth on a Single-Crystal Alumina Substrate , 1962 .

[10]  Yu. V. Pleskov,et al.  Russian Text Ignored , 1962 .

[11]  C. Hargreaves.  On the Growth of Sapphire Microcrystals , 1961 .

[12]  C. R. Morelock,et al.  Growth of Whiskers by Chemical Reactions , 1961 .

[13]  R. C. Devries,et al.  Growth of Aluminum Oxide Whiskers by Vapor Deposition , 1959 .

[14]  W. Webb,et al.  Detection of Screw Dislocations in α‐Al2O3 Whiskers , 1958 .

[15]  W. Webb,et al.  Growth and Defect Structure of Sapphire Microcrystals , 1957 .

[16]  G. Sears.  Influence of Adsorbed Films on Crystal Growth Kinetics , 1956 .

[17]  S. Brenner,et al.  Mechanism of whisker growth—III nature of growth sites , 1956 .

[18]  G. W Sears,et al.  A growth mechanism for mercury whiskers , 1955 .

[19]  F. C. Frank,et al.  The influence of dislocations on crystal growth , 1949 .