Preparation of Transparent <TEX>${gamma}$</TEX>-<TEX>$6Bi_2O_3$</TEX>.<TEX>$GeO_2$</TEX> Polycrystals by Unidirection Solidification of Melt

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J. Korean Ceram. Soc. > Volume 27(4); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(4): 567.

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

김호건, 김명섭, 류일환

한양대학교 화학과

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

ABSTRACT

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.