Accession Number : ADP011868


Title :   Possibilities and Limitations of Multioxides Crystals Growth


Descriptive Note : Conference proceedings


Corporate Author : POLISH ACADEMY OF SCIENCES WARSAW INSTOF PHYSICS


Personal Author(s) : Berkowski, M ; Fink-Finowicki, J ; Aleksiyko, R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/p011868.pdf


Report Date : Jan 2001


Pagination or Media Count : 7


Abstract : The main methods of crystal growth from the melt the Czochralski and floating zone will be discussed and compared. Advantages, disadvantages and limitations of both methods as well as ways of solving some of the problems existing during growth of different types of multioxides crystals will be discussed. The chemical composition of crystals grown by the Czochralski method very often differs from the stoichiometric composition. Such deviations were found and well documented in a few groups of materials for example in garnets. Since the deviation is not known for most of the crystals, a simple way to determine the optimum starting composition of the melt will be presented. In order to determine the composition of the melt one should take into account evaporation of a volatile component that dissociates at high temperatures during crystal growth. Some problems related to the dopant distribution along the crystal growth direction in correlation with segregation coefficient for both methods will be discussed. To grow solid solution single crystals by the Czochralski method with a desired concentration of the admixture one has to know segregation coefficients of the components. A few examples of the dopant solubility limit in different crystal matrices will be presented.


Descriptors :   *SINGLE CRYSTALS , *OXIDES , *CRYSTAL GROWTH , SYMPOSIA , HIGH TEMPERATURE , CHEMICAL COMPOSITION , SEGREGATION(METALLURGY) , LIMITATIONS , COEFFICIENTS , EVAPORATION , SOLUBILITY , SOLID SOLUTIONS , STOICHIOMETRY , GARNET , POLAND , CZOCHRALSKI CRYSTALS


Subject Categories : Physical Chemistry
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE