Admixtures on Crystal Growth

There exist a number of books and papers dealing with the theory of crystal growth [100.112.130,152,178,179.184.185.202.2431. Quantities, necessary for the application of these theories, are often not known so several simplifications have to be adopted. Fundamental physical quantities then lose their physical meaning and become adjustable parameters. In addition, experimental methods [72,178] provide data of limited accuracy so that the fit of experiments and theory often becomes a matter of statistics. This must be kept In mind when discussing the effect of admixtures on the growth rate of crystals. 

Due to the different structures and energetical situations growth rate of Individual crystal faces is also different. This also holds for the effect of admixtures on the growth rate of crystals and this Is why Individual crystal faces must be considered separately. The effect of growth rate dispersion can lead to different values on individual crystals, however, and this may be one of the reasons why the literature data are scattered and differ from those obtained by measurements in suspension (116, 226]. 

---