Accession Number : AD0692762

Title :   ON THE DIFFUSION METHOD OF CRYSTAL GROWTH,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Lendvay,Odon

Report Date : JUN 1969

Pagination or Media Count : 32

Abstract : The simplest technical method for producing crystals of poorly soluble materials is diffusion growth. Through Diffusion growth nucleation processes may be limited or extended to chosen extent. The location and time of initiation for nucleation are directly calculable if the critical supersaturation or solubility product is known. The modification of nucleation time, duration, speed, time expansion, or contraction of extent may be achieved by simple methods. By the selection of experimental conditions different size distribution crystalline precipitates or macrocrystals may be produced. The latter may reach 1 cm size if system parameters are chosen correctly. The maximum dimensions of crystals produced are determined by the relationship of speed, nucleation, and growth. Largest dimensions through growth are usually exhibited by dendrites, twins, plain crystals, and needles. The so-called space crystals (where all three dimensions of the crystal are nearly equal) are generally smaller than the previous ones. The method has increased importance in cases where usual crystal growth methods may not be employed due ot the characteristics of the crystal to be produced. (Author)

Descriptors :   (*CRYSTAL GROWTH, DIFFUSION), NUCLEATION, SOLUTIONS(MIXTURES), DENDRITIC STRUCTURE, CALCIUM COMPOUNDS, STRONTIUM COMPOUNDS, ZINC COMPOUNDS, CARBONATES, SULFIDES, MANGANESE

Subject Categories : Physical Chemistry
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE