Author : Charles S. Sahagian
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.3/5 (91 download)
Book Synopsis Crystal Perfection of Alpha-AI2O3 as a Function of Growth Method by : Charles S. Sahagian
Download or read book Crystal Perfection of Alpha-AI2O3 as a Function of Growth Method written by Charles S. Sahagian and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthetic ruby and sapphire crystals grown by flame-fusion and flux methods are described and discussed in terms of growth method and growth techniques. Dislocation densities are given for all samples, and comparisons are made in an attempt to obtain correlation between the growth method used and the resulting lattice defect structure. Data are presented for crystals grown by various methods, namely, Verneuil, flux, hydrothermal, electron-beam zone refining, Czochralski, vapor deposition, and plasma torch methods. Dislocation density evaluation is based on chemical etchpit analysis, which produced average dislocation density values varying from about 1,000,000/sq cm for crystals grown by the plasma torch method to about 1000/sq cm for crystals grown by the electron-beam method. Crystals grown by the other methods mentioned about show dislocation densities lying between these values. A brief description is presented of the chemical etching techniques and apparatus used at AFCRL. (Author).