Growth of RIG Single Crystals by Flux Technique

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J. Korean Ceram. Soc. > Volume 26(4); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(4): 459.

융제법에 의한 RIG 단결정 육성

김성현, 이석희¹, 정수진¹

서울대학교 무기공학과
¹서울대학교 무기재료공학과

Growth of RIG Single Crystals by Flux Technique

ABSTRACT

Single crystals of rare-earth iron garnets were grown from solutions of molten lead oxide, lead fluoride, baric oxide, iron oxide, and the oxides of yttrium, samarium orgadolinium. The crystals were grown by slow cooling technique. A convenient composition was 41.8mol% PbO, 20.59mol% PbF2, 8.23mol% B2O3, 20.00mol% Fe2O3 and 10.00mol% R2O3 where R is Y, Sm or Gd. For this experiment, platinum crucibles of size 20, 30cc and a vertical siliconit tube furnace were used. The precipitation temperature of YIG was observed in the range of 115$0^{circ}C$-112$0^{circ}C$ and the optimum growth conditions in this experiment were determined. The nucleation rate was controlled by the holding time after the fast colling, the growth rate by the slow cooling conditiions. The form of the grown YIG crystals showed a combination of {110} and {211}, and the size of the crystals grown in this experiment was up to about 9mm under the conditions of holding time 16hour, cooling rate 2$^{circ}C$/hr. and temperature range 115$0^{circ}C$-90$0^{circ}C$. The precipitatin temperature of SmIG was observed in the range of 105$0^{circ}C$-98$0^{circ}C$ and the size of the crystals grown in this experiment was up to about 5mm under the conditiions of holding time 16hours, cooling rate 2$^{circ}C$/hr. and temperature range 100$0^{circ}C$-80$0^{circ}C$.