Preparation of Composite Polycrystals Including <TEX>${gamma}$</TEX>-<TEX>$6Bi_2O_3$</TEX>.<TEX>$SiO_2$</TEX>

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J. Korean Ceram. Soc. > Volume 23(2); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(2): 13.

${gamma}$-$6Bi_2O_3$.$SiO_2$ 결정을 포함하는 복합다결정체의 작성

김호건

한양대학교 화학과

Preparation of Composite Polycrystals Including ${gamma}$-$6Bi_2O_3$.$SiO_2$

ABSTRACT

Composite polycrystals including ${gamma}$-$6Bi_2O_3$.$SiO_2$ crystal which have needlelike regular structure are useful for the high resolution optical devices. For the purpose of obtaining the composite polycrystals described above the melts of eutectic composition in the three eutectic systems including $6Bi_2O_3$.$SiO_2$ composition were unidirectionally solidified at a rate of 0.05 and 0.25 cm/h under a thermal gradient of 10$0^{circ}C$/m. Composite polycrystals of relatively regular structure in which needlelike ${gamma}$-$6Bi_2O_3$.$SiO_2$ crystals were arrayed in parallel with $2Bi_2O_3$.$B_2O_3$ crystal matrix were obtained when the eutectic melt of $6Bi_2O_3$.$SiO_2 -2Bi_2O_3$.$B_2O_3$ system was solidified at a rate of 0.25 cm/h. Partial structural irregularity however was found in the obtained composite polycrystals.