Preparation of Transparent ${\gamma}$-$6Bi_2O_3$.$GeO_2$ Polycrystals by Unidirection Solidification of Melt

융액 일방향 응고법에 의한 ${\gamma}$-$6Bi_2O_3$.$GeO_2$ 투명 다결정체의 제조

  • 김호건 (한양대학교 화학과) ;
  • 김명섭 (한양대학교 화학과) ;
  • 류일환 (한양대학교 화학과)
  • Published : 1990.04.01


Solidification condition for preparing transparent ${\gamma}$-6Bi2O3.GeO2 polycrystals by unidirectional solidification of melt, were investigaetd and the properties of the polycrystals prepared were measured. The ${\gamma}$-6Bi2O3.GeO2 polycrystals showing transparency like a single crystal were obtained by the unidirectional solidification of ${\gamma}$-6Bi2O3.GeO2 melt at a solidification rate of 0.5mm/h under a thermal gradient of 12$0^{\circ}C$/cm. The transparent polycrystals obtained showed the same photoconduction and optical activity as the ${\gamma}$-6Bi2O3.GeO2 single crystals grown by Czochralski method. But the electro-optic effect of polycrystals was heterogeneous because the colummar ${\gamma}$-6Bi2O3.GeO2 crystals were not oriented to the particular crystallographic direction.



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